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4x+(159-3x)=180
We move all terms to the left:
4x+(159-3x)-(180)=0
We add all the numbers together, and all the variables
4x+(-3x+159)-180=0
We get rid of parentheses
4x-3x+159-180=0
We add all the numbers together, and all the variables
x-21=0
We move all terms containing x to the left, all other terms to the right
x=21
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