Answer:
x=3
Step-by-step explanation:
minus 3x on both sides
after you've subtracted 3x from both sides you then need to minus 12 from both sides
Last step is going to be dividing by 2 and you should get the answer of 3
3x
12+5x=18+3x
-5x -5x
12= 18 + - 2x
-18 -18
-6 = -2x
÷ -2
answer is 3x
Modern:عشرين
Ancient Egypt:
Two Upside down U’s
a=7
24^2+a^2=25^2
576+a^2=625
49=a^2
