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340+5x=640-8x
We move all terms to the left:
340+5x-(640-8x)=0
We add all the numbers together, and all the variables
5x-(-8x+640)+340=0
We get rid of parentheses
5x+8x-640+340=0
We add all the numbers together, and all the variables
13x-300=0
We move all terms containing x to the left, all other terms to the right
13x=300
x=300/13
x=23+1/13
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