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14x-70=12x-30
We move all terms to the left:
14x-70-(12x-30)=0
We get rid of parentheses
14x-12x+30-70=0
We add all the numbers together, and all the variables
2x-40=0
We move all terms containing x to the left, all other terms to the right
2x=40
x=40/2
x=20
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