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12x-10=8x-30
We move all terms to the left:
12x-10-(8x-30)=0
We get rid of parentheses
12x-8x+30-10=0
We add all the numbers together, and all the variables
4x+20=0
We move all terms containing x to the left, all other terms to the right
4x=-20
x=-20/4
x=-5
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