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12x-199=3x-10
We move all terms to the left:
12x-199-(3x-10)=0
We get rid of parentheses
12x-3x+10-199=0
We add all the numbers together, and all the variables
9x-189=0
We move all terms containing x to the left, all other terms to the right
9x=189
x=189/9
x=21
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