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21=0.2x+50
We move all terms to the left:
21-(0.2x+50)=0
We get rid of parentheses
-0.2x-50+21=0
We add all the numbers together, and all the variables
-0.2x-29=0
We move all terms containing x to the left, all other terms to the right
-0.2x=29
x=29/-0.2
x=-145
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