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3x-5+x-5+4x+10=90
We move all terms to the left:
3x-5+x-5+4x+10-(90)=0
We add all the numbers together, and all the variables
8x-90=0
We move all terms containing x to the left, all other terms to the right
8x=90
x=90/8
x=11+1/4
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