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(80+20)x=450+20x
We move all terms to the left:
(80+20)x-(450+20x)=0
We add all the numbers together, and all the variables
100x-(20x+450)=0
We get rid of parentheses
100x-20x-450=0
We add all the numbers together, and all the variables
80x-450=0
We move all terms containing x to the left, all other terms to the right
80x=450
x=450/80
x=5+5/8
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