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90=12x+30
We move all terms to the left:
90-(12x+30)=0
We get rid of parentheses
-12x-30+90=0
We add all the numbers together, and all the variables
-12x+60=0
We move all terms containing x to the left, all other terms to the right
-12x=-60
x=-60/-12
x=+5
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