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6x+8(7000-x)=520
We move all terms to the left:
6x+8(7000-x)-(520)=0
We add all the numbers together, and all the variables
6x+8(-1x+7000)-520=0
We multiply parentheses
6x-8x+56000-520=0
We add all the numbers together, and all the variables
-2x+55480=0
We move all terms containing x to the left, all other terms to the right
-2x=-55480
x=-55480/-2
x=+27740
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