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-5(3+x)=100
We move all terms to the left:
-5(3+x)-(100)=0
We add all the numbers together, and all the variables
-5(x+3)-100=0
We multiply parentheses
-5x-15-100=0
We add all the numbers together, and all the variables
-5x-115=0
We move all terms containing x to the left, all other terms to the right
-5x=115
x=115/-5
x=-23
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