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2x-3+3x-2+4x+15=90
We move all terms to the left:
2x-3+3x-2+4x+15-(90)=0
We add all the numbers together, and all the variables
9x-80=0
We move all terms containing x to the left, all other terms to the right
9x=80
x=80/9
x=8+8/9
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