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20=0.50x+10
We move all terms to the left:
20-(0.50x+10)=0
We get rid of parentheses
-0.50x-10+20=0
We add all the numbers together, and all the variables
-0.5x+10=0
We move all terms containing x to the left, all other terms to the right
-0.5x=-10
x=-10/-0.5
x=+20
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