3=12+r/8

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Solution for 3=12+r/8 equation: 



3=12+r/8

We move all terms to the left:

3-(12+r/8)=0

We add all the numbers together, and all the variables

-(r/8+12)+3=0

We get rid of parentheses

-r/8-12+3=0

We multiply all the terms by the denominator


-r-12*8+3*8=0

We add all the numbers together, and all the variables

-1r-72=0

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

-r=72

r=72/-1

r=-72

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