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3x+5+2x+2+3x-5=90
We move all terms to the left:
3x+5+2x+2+3x-5-(90)=0
We add all the numbers together, and all the variables
8x-88=0
We move all terms containing x to the left, all other terms to the right
8x=88
x=88/8
x=11
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