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12x-245=7x+340
We move all terms to the left:
12x-245-(7x+340)=0
We get rid of parentheses
12x-7x-340-245=0
We add all the numbers together, and all the variables
5x-585=0
We move all terms containing x to the left, all other terms to the right
5x=585
x=585/5
x=117
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