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6x+12=8x-30
We move all terms to the left:
6x+12-(8x-30)=0
We get rid of parentheses
6x-8x+30+12=0
We add all the numbers together, and all the variables
-2x+42=0
We move all terms containing x to the left, all other terms to the right
-2x=-42
x=-42/-2
x=+21
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