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12x+17=5x+45
We move all terms to the left:
12x+17-(5x+45)=0
We get rid of parentheses
12x-5x-45+17=0
We add all the numbers together, and all the variables
7x-28=0
We move all terms containing x to the left, all other terms to the right
7x=28
x=28/7
x=4
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