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6x-12=2x+30
We move all terms to the left:
6x-12-(2x+30)=0
We get rid of parentheses
6x-2x-30-12=0
We add all the numbers together, and all the variables
4x-42=0
We move all terms containing x to the left, all other terms to the right
4x=42
x=42/4
x=10+1/2
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