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2x+2x+x-1+2x-3=90
We move all terms to the left:
2x+2x+x-1+2x-3-(90)=0
We add all the numbers together, and all the variables
7x-94=0
We move all terms containing x to the left, all other terms to the right
7x=94
x=94/7
x=13+3/7
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