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20=0.50x+5
We move all terms to the left:
20-(0.50x+5)=0
We get rid of parentheses
-0.50x-5+20=0
We add all the numbers together, and all the variables
-0.5x+15=0
We move all terms containing x to the left, all other terms to the right
-0.5x=-15
x=-15/-0.5
x=+30
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