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450-40x=975-45x-20x
We move all terms to the left:
450-40x-(975-45x-20x)=0
We add all the numbers together, and all the variables
-40x-(-65x+975)+450=0
We get rid of parentheses
-40x+65x-975+450=0
We add all the numbers together, and all the variables
25x-525=0
We move all terms containing x to the left, all other terms to the right
25x=525
x=525/25
x=21
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