Remember, you can do anything to an equation as long as you do it to both sides
times both sides by -1
7-5x=2x
add 5x both sides
7=7x
divide both sides by 7
1=x
x=1
6.05 is six and five hundredths in decimal form.
Sum = n/2[2a + (n - 1)d] where a = first term, n = number of terms and d = common difference
(a) 30/2(2 x 5 + (30 - 1) x d) = 1455
10 + 29d = 1455 / 15
29d = 97 - 10
d = 87 / 29 = 3
(b) 7/2(2 x 9 + (7 - 1)d) = 0
18 + 6d = 0
6d = -18
d = -3
Answer:
5 because if you do 6/3 and 10/x you would 10 times 3 then divide that by 6
