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300+85x=400+125x-700
We move all terms to the left:
300+85x-(400+125x-700)=0
We add all the numbers together, and all the variables
85x-(125x-300)+300=0
We get rid of parentheses
85x-125x+300+300=0
We add all the numbers together, and all the variables
-40x+600=0
We move all terms containing x to the left, all other terms to the right
-40x=-600
x=-600/-40
x=+15
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