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12+7x=27+4x
We move all terms to the left:
12+7x-(27+4x)=0
We add all the numbers together, and all the variables
7x-(4x+27)+12=0
We get rid of parentheses
7x-4x-27+12=0
We add all the numbers together, and all the variables
3x-15=0
We move all terms containing x to the left, all other terms to the right
3x=15
x=15/3
x=5
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