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-20=x/0.5
We move all terms to the left:
-20-(x/0.5)=0
We add all the numbers together, and all the variables
-(+x/0.5)-20=0
We get rid of parentheses
-x/0.5-20=0
We multiply all the terms by the denominator
-x-20*0.5=0
We add all the numbers together, and all the variables
-1x-10=0
We move all terms containing x to the left, all other terms to the right
-x=10
x=10/-1
x=-10
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