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5x+12=6x-1+121
We move all terms to the left:
5x+12-(6x-1+121)=0
We add all the numbers together, and all the variables
5x-(6x+120)+12=0
We get rid of parentheses
5x-6x-120+12=0
We add all the numbers together, and all the variables
-1x-108=0
We move all terms containing x to the left, all other terms to the right
-x=108
x=108/-1
x=-108
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