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(2x)+(3x)+(3x+12)=180
We move all terms to the left:
(2x)+(3x)+(3x+12)-(180)=0
We add all the numbers together, and all the variables
5x+(3x+12)-180=0
We get rid of parentheses
5x+3x+12-180=0
We add all the numbers together, and all the variables
8x-168=0
We move all terms containing x to the left, all other terms to the right
8x=168
x=168/8
x=21
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