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120=4x+3+9x+13
We move all terms to the left:
120-(4x+3+9x+13)=0
We add all the numbers together, and all the variables
-(13x+16)+120=0
We get rid of parentheses
-13x-16+120=0
We add all the numbers together, and all the variables
-13x+104=0
We move all terms containing x to the left, all other terms to the right
-13x=-104
x=-104/-13
x=+8
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