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-x+5(2x+8)=85
We move all terms to the left:
-x+5(2x+8)-(85)=0
We add all the numbers together, and all the variables
-1x+5(2x+8)-85=0
We multiply parentheses
-1x+10x+40-85=0
We add all the numbers together, and all the variables
9x-45=0
We move all terms containing x to the left, all other terms to the right
9x=45
x=45/9
x=5
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