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12x=5x+72
We move all terms to the left:
12x-(5x+72)=0
We get rid of parentheses
12x-5x-72=0
We add all the numbers together, and all the variables
7x-72=0
We move all terms containing x to the left, all other terms to the right
7x=72
x=72/7
x=10+2/7
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