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12x+17=19x+39
We move all terms to the left:
12x+17-(19x+39)=0
We get rid of parentheses
12x-19x-39+17=0
We add all the numbers together, and all the variables
-7x-22=0
We move all terms containing x to the left, all other terms to the right
-7x=22
x=22/-7
x=-3+1/7
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