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12x-10=9x-19
We move all terms to the left:
12x-10-(9x-19)=0
We get rid of parentheses
12x-9x+19-10=0
We add all the numbers together, and all the variables
3x+9=0
We move all terms containing x to the left, all other terms to the right
3x=-9
x=-9/3
x=-3
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