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12+7x=5.
We move all terms to the left:
12+7x-(5.)=0
We add all the numbers together, and all the variables
7x+12-5=0
We add all the numbers together, and all the variables
7x+7=0
We move all terms containing x to the left, all other terms to the right
7x=-7
x=-7/7
x=-1
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