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12x+72=10x+30
We move all terms to the left:
12x+72-(10x+30)=0
We get rid of parentheses
12x-10x-30+72=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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