4 - c = 1/3...multiply everything by 3 12 - 3c = 1 -3c = 1 - 12 -3c = -11 c = 11/3 <== ================ -14 = x - 12 -14 + 12 = x -2 = x <== ================ s / 1.5 = 0.8...multiply both sides by 1.5 s = 0.8 * 1.5 s = 1.2 <== =============== 0.4r = 1.6...divide both sides by 0.4 r = 1.6 / 0.4 r = 4 <== =============== 2d - 15 = 3 2d = 3 + 15 2d = 18 d = 18/2 d = 9 <== =============== 4 = 3/4m - 6...multiply by 4 16 = 3m - 24 16 + 24 = 3m 40 = 3m 40/3 = m <== =============== -3(n + 6) + 10 = -8 -3n - 18 + 10 = -8 -3n - 8 = -8 -3n = -8 + 8 -3n = 0 n = 0 <== =============== 1.5(q - 4) - 2 = 4 1.5q - 6 - 2 = 4 1.5q - 8 = 4 1.5q = 4 + 8 1.5q = 12 q = 12 / 1.5 q = 8 <= ================ 1/3x + x - 20 + x - 10 + 40 = 360 1/3x + 2x + 10 = 360 1/3x + 6/3x = 360 - 10 7/3x = 350 x = 350 * 3/7 x = 150
< 1/3x is (1/3 * 150) = 150/3 = 50 degrees < x - 20 is (150 - 20) = 130 degrees < x - 10 is (150 - 10) = 140 < 40 = 40 degrees ======================== 1/2x + 1/2x + x - 15 + x - 25 + 100 = 540 3x + 60 = 540 3x = 540 - 60 3x = 480 x = 480/3 x = 160
< 1/2x is (1/2 * 160) = 160/2 = 80 degrees < 1/2x is 80 degrees < x - 15 is (160 - 15) = 145 degrees < x - 25 is (160 - 25) = 135 degrees < 100 is 100 degrees ===================== 110 = 10a - 20 110 + 20 = 10a 130 = 10a 130/10 = a 13 = a <== he spent $ 13 on ads ==================== 0.5x + 45 + x + 2x = 150 3.5x + 45 = 150 3.5x = 150 - 45 3.5x = 105 x = 105 / 3.5 x = 30
0.5x is (0.5 * 30) = 15 ft 45 ft 2x is (2 * 30) = 60 ft 30 ft ====================== 60x = 360 x = 360/60 x = 6 hrs <== ====================== (8 + 9 + 12 + c) / 4 = 10 (29 + c) / 4 = 10 29 + c = 10 * 4 29 + c = 40 c = 40 - 29 c = 11 <== he would have to sell 11 cars in the 4th month
