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75=15x+15
We move all terms to the left:
75-(15x+15)=0
We get rid of parentheses
-15x-15+75=0
We add all the numbers together, and all the variables
-15x+60=0
We move all terms containing x to the left, all other terms to the right
-15x=-60
x=-60/-15
x=+4
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