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(-16x+13)+(20x+13)=180
We move all terms to the left:
(-16x+13)+(20x+13)-(180)=0
We get rid of parentheses
-16x+20x+13+13-180=0
We add all the numbers together, and all the variables
4x-154=0
We move all terms containing x to the left, all other terms to the right
4x=154
x=154/4
x=38+1/2
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