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x+2x+x-1+2x+2x-3=76
We move all terms to the left:
x+2x+x-1+2x+2x-3-(76)=0
We add all the numbers together, and all the variables
8x-80=0
We move all terms containing x to the left, all other terms to the right
8x=80
x=80/8
x=10
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