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12x+19=10x-12
We move all terms to the left:
12x+19-(10x-12)=0
We get rid of parentheses
12x-10x+12+19=0
We add all the numbers together, and all the variables
2x+31=0
We move all terms containing x to the left, all other terms to the right
2x=-31
x=-31/2
x=-15+1/2
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