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(10x-9)+(4x+21)=180
We move all terms to the left:
(10x-9)+(4x+21)-(180)=0
We get rid of parentheses
10x+4x-9+21-180=0
We add all the numbers together, and all the variables
14x-168=0
We move all terms containing x to the left, all other terms to the right
14x=168
x=168/14
x=12
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