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10x+30=x+12
We move all terms to the left:
10x+30-(x+12)=0
We get rid of parentheses
10x-x-12+30=0
We add all the numbers together, and all the variables
9x+18=0
We move all terms containing x to the left, all other terms to the right
9x=-18
x=-18/9
x=-2
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