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6x-10=12x+20
We move all terms to the left:
6x-10-(12x+20)=0
We get rid of parentheses
6x-12x-20-10=0
We add all the numbers together, and all the variables
-6x-30=0
We move all terms containing x to the left, all other terms to the right
-6x=30
x=30/-6
x=-5
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