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19x+12=6x+15x-12
We move all terms to the left:
19x+12-(6x+15x-12)=0
We add all the numbers together, and all the variables
19x-(21x-12)+12=0
We get rid of parentheses
19x-21x+12+12=0
We add all the numbers together, and all the variables
-2x+24=0
We move all terms containing x to the left, all other terms to the right
-2x=-24
x=-24/-2
x=+12
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