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12x+23=5x+79
We move all terms to the left:
12x+23-(5x+79)=0
We get rid of parentheses
12x-5x-79+23=0
We add all the numbers together, and all the variables
7x-56=0
We move all terms containing x to the left, all other terms to the right
7x=56
x=56/7
x=8
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