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90(x+23)+(x+13)=180
We move all terms to the left:
90(x+23)+(x+13)-(180)=0
We multiply parentheses
90x+(x+13)+2070-180=0
We get rid of parentheses
90x+x+13+2070-180=0
We add all the numbers together, and all the variables
91x+1903=0
We move all terms containing x to the left, all other terms to the right
91x=-1903
x=-1903/91
x=-20+83/91
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