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2x+75=4x+15
We move all terms to the left:
2x+75-(4x+15)=0
We get rid of parentheses
2x-4x-15+75=0
We add all the numbers together, and all the variables
-2x+60=0
We move all terms containing x to the left, all other terms to the right
-2x=-60
x=-60/-2
x=+30
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