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5x+30=12x-30
We move all terms to the left:
5x+30-(12x-30)=0
We get rid of parentheses
5x-12x+30+30=0
We add all the numbers together, and all the variables
-7x+60=0
We move all terms containing x to the left, all other terms to the right
-7x=-60
x=-60/-7
x=8+4/7
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