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-4(5+2x)=(-100)
We move all terms to the left:
-4(5+2x)-((-100))=0
We add all the numbers together, and all the variables
-4(2x+5)-((-100))=0
We add all the numbers together, and all the variables
-4(2x+5)+100=0
We multiply parentheses
-8x-20+100=0
We add all the numbers together, and all the variables
-8x+80=0
We move all terms containing x to the left, all other terms to the right
-8x=-80
x=-80/-8
x=+10
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