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10x+500=8x+700
We move all terms to the left:
10x+500-(8x+700)=0
We get rid of parentheses
10x-8x-700+500=0
We add all the numbers together, and all the variables
2x-200=0
We move all terms containing x to the left, all other terms to the right
2x=200
x=200/2
x=100
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