12=10+r/2

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Solution for 12=10+r/2 equation: 



12=10+r/2

We move all terms to the left:

12-(10+r/2)=0

We add all the numbers together, and all the variables

-(r/2+10)+12=0

We get rid of parentheses

-r/2-10+12=0

We multiply all the terms by the denominator


-r-10*2+12*2=0

We add all the numbers together, and all the variables

-1r+4=0

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

-r=-4

r=-4/-1

r=+4

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