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2x+2x-3+2x-4=90
We move all terms to the left:
2x+2x-3+2x-4-(90)=0
We add all the numbers together, and all the variables
6x-97=0
We move all terms containing x to the left, all other terms to the right
6x=97
x=97/6
x=16+1/6
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