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x+18+3x=70+55+55
We move all terms to the left:
x+18+3x-(70+55+55)=0
We add all the numbers together, and all the variables
x+3x+18-180=0
We add all the numbers together, and all the variables
4x-162=0
We move all terms containing x to the left, all other terms to the right
4x=162
x=162/4
x=40+1/2
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