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-75=-15+3x
We move all terms to the left:
-75-(-15+3x)=0
We add all the numbers together, and all the variables
-(3x-15)-75=0
We get rid of parentheses
-3x+15-75=0
We add all the numbers together, and all the variables
-3x-60=0
We move all terms containing x to the left, all other terms to the right
-3x=60
x=60/-3
x=-20
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