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12x-5=7x+18
We move all terms to the left:
12x-5-(7x+18)=0
We get rid of parentheses
12x-7x-18-5=0
We add all the numbers together, and all the variables
5x-23=0
We move all terms containing x to the left, all other terms to the right
5x=23
x=23/5
x=4+3/5
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