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3x+10+5(x-10)=90
We move all terms to the left:
3x+10+5(x-10)-(90)=0
We add all the numbers together, and all the variables
3x+5(x-10)-80=0
We multiply parentheses
3x+5x-50-80=0
We add all the numbers together, and all the variables
8x-130=0
We move all terms containing x to the left, all other terms to the right
8x=130
x=130/8
x=16+1/4
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