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340+7x=640+8x
We move all terms to the left:
340+7x-(640+8x)=0
We add all the numbers together, and all the variables
7x-(8x+640)+340=0
We get rid of parentheses
7x-8x-640+340=0
We add all the numbers together, and all the variables
-1x-300=0
We move all terms containing x to the left, all other terms to the right
-x=300
x=300/-1
x=-300
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