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X+3X+(X-8)=133
We move all terms to the left:
X+3X+(X-8)-(133)=0
We add all the numbers together, and all the variables
4X+(X-8)-133=0
We get rid of parentheses
4X+X-8-133=0
We add all the numbers together, and all the variables
5X-141=0
We move all terms containing X to the left, all other terms to the right
5X=141
X=141/5
X=28+1/5
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