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2(-5x-10)=100
We move all terms to the left:
2(-5x-10)-(100)=0
We multiply parentheses
-10x-20-100=0
We add all the numbers together, and all the variables
-10x-120=0
We move all terms containing x to the left, all other terms to the right
-10x=120
x=120/-10
x=-12
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