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400x-(520+2x)=1000
We move all terms to the left:
400x-(520+2x)-(1000)=0
We add all the numbers together, and all the variables
400x-(2x+520)-1000=0
We get rid of parentheses
400x-2x-520-1000=0
We add all the numbers together, and all the variables
398x-1520=0
We move all terms containing x to the left, all other terms to the right
398x=1520
x=1520/398
x=3+163/199
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