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2x+5(-5x+3)=-100
We move all terms to the left:
2x+5(-5x+3)-(-100)=0
We add all the numbers together, and all the variables
2x+5(-5x+3)+100=0
We multiply parentheses
2x-25x+15+100=0
We add all the numbers together, and all the variables
-23x+115=0
We move all terms containing x to the left, all other terms to the right
-23x=-115
x=-115/-23
x=+5
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