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400x=-260x+8580
We move all terms to the left:
400x-(-260x+8580)=0
We get rid of parentheses
400x+260x-8580=0
We add all the numbers together, and all the variables
660x-8580=0
We move all terms containing x to the left, all other terms to the right
660x=8580
x=8580/660
x=13
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