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12x-20=-19x-230
We move all terms to the left:
12x-20-(-19x-230)=0
We get rid of parentheses
12x+19x+230-20=0
We add all the numbers together, and all the variables
31x+210=0
We move all terms containing x to the left, all other terms to the right
31x=-210
x=-210/31
x=-6+24/31
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