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340+5x=665-8x
We move all terms to the left:
340+5x-(665-8x)=0
We add all the numbers together, and all the variables
5x-(-8x+665)+340=0
We get rid of parentheses
5x+8x-665+340=0
We add all the numbers together, and all the variables
13x-325=0
We move all terms containing x to the left, all other terms to the right
13x=325
x=325/13
x=25
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