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140x+600=100x+700
We move all terms to the left:
140x+600-(100x+700)=0
We get rid of parentheses
140x-100x-700+600=0
We add all the numbers together, and all the variables
40x-100=0
We move all terms containing x to the left, all other terms to the right
40x=100
x=100/40
x=2+1/2
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