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12+2x=12*
We move all terms to the left:
12+2x-(12*)=0
We add all the numbers together, and all the variables
2x+12-0=0
We add all the numbers together, and all the variables
2x+12=0
We move all terms containing x to the left, all other terms to the right
2x=-12
x=-12/2
x=-6
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