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-5(-5+4x)=-215
We move all terms to the left:
-5(-5+4x)-(-215)=0
We add all the numbers together, and all the variables
-5(4x-5)-(-215)=0
We add all the numbers together, and all the variables
-5(4x-5)+215=0
We multiply parentheses
-20x+25+215=0
We add all the numbers together, and all the variables
-20x+240=0
We move all terms containing x to the left, all other terms to the right
-20x=-240
x=-240/-20
x=+12
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