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8(x+-10)=40
We move all terms to the left:
8(x+-10)-(40)=0
We add all the numbers together, and all the variables
8(x-10)-40=0
We multiply parentheses
8x-80-40=0
We add all the numbers together, and all the variables
8x-120=0
We move all terms containing x to the left, all other terms to the right
8x=120
x=120/8
x=15
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