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10(8-2x)=100
We move all terms to the left:
10(8-2x)-(100)=0
We add all the numbers together, and all the variables
10(-2x+8)-100=0
We multiply parentheses
-20x+80-100=0
We add all the numbers together, and all the variables
-20x-20=0
We move all terms containing x to the left, all other terms to the right
-20x=20
x=20/-20
x=-1
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