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(7x-15)+(4x-3)+(x+28)=180
We move all terms to the left:
(7x-15)+(4x-3)+(x+28)-(180)=0
We get rid of parentheses
7x+4x+x-15-3+28-180=0
We add all the numbers together, and all the variables
12x-170=0
We move all terms containing x to the left, all other terms to the right
12x=170
x=170/12
x=14+1/6
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