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2x+3x+3+x+8+4x=91
We move all terms to the left:
2x+3x+3+x+8+4x-(91)=0
We add all the numbers together, and all the variables
10x-80=0
We move all terms containing x to the left, all other terms to the right
10x=80
x=80/10
x=8
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