20=10+r/2

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Solution for 20=10+r/2 equation: 



20=10+r/2

We move all terms to the left:

20-(10+r/2)=0

We add all the numbers together, and all the variables

-(r/2+10)+20=0

We get rid of parentheses

-r/2-10+20=0

We multiply all the terms by the denominator


-r-10*2+20*2=0

We add all the numbers together, and all the variables

-1r+20=0

We move all terms containing r to the left, all other terms to the right

-r=-20

r=-20/-1

r=+20

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