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31=0.2x+20.2
We move all terms to the left:
31-(0.2x+20.2)=0
We get rid of parentheses
-0.2x-20.2+31=0
We add all the numbers together, and all the variables
-0.2x+10.8=0
We move all terms containing x to the left, all other terms to the right
-0.2x=-10.8
x=-10.8/-0.2
x=+54
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