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12x+7=12+7
We move all terms to the left:
12x+7-(12+7)=0
We add all the numbers together, and all the variables
12x+7-19=0
We add all the numbers together, and all the variables
12x-12=0
We move all terms containing x to the left, all other terms to the right
12x=12
x=12/12
x=1
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