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3x+(x+28)=180
We move all terms to the left:
3x+(x+28)-(180)=0
We get rid of parentheses
3x+x+28-180=0
We add all the numbers together, and all the variables
4x-152=0
We move all terms containing x to the left, all other terms to the right
4x=152
x=152/4
x=38
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