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20x+32(21-x)=600
We move all terms to the left:
20x+32(21-x)-(600)=0
We add all the numbers together, and all the variables
20x+32(-1x+21)-600=0
We multiply parentheses
20x-32x+672-600=0
We add all the numbers together, and all the variables
-12x+72=0
We move all terms containing x to the left, all other terms to the right
-12x=-72
x=-72/-12
x=+6
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