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13x-12=8x-19+6x-12
We move all terms to the left:
13x-12-(8x-19+6x-12)=0
We add all the numbers together, and all the variables
13x-(14x-31)-12=0
We get rid of parentheses
13x-14x+31-12=0
We add all the numbers together, and all the variables
-1x+19=0
We move all terms containing x to the left, all other terms to the right
-x=-19
x=-19/-1
x=+19
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