15+12=(15-6r)+2r

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Solution for 15+12=(15-6r)+2r equation: 



15+12=(15-6r)+2r

We move all terms to the left:

15+12-((15-6r)+2r)=0

We add all the numbers together, and all the variables

-((-6r+15)+2r)+15+12=0

We add all the numbers together, and all the variables

-((-6r+15)+2r)+27=0



We calculate terms in parentheses: -((-6r+15)+2r), so:

(-6r+15)+2r

We add all the numbers together, and all the variables

2r+(-6r+15)

We get rid of parentheses

2r-6r+15

We add all the numbers together, and all the variables

-4r+15

Back to the equation:

-(-4r+15)



We get rid of parentheses

4r-15+27=0

We add all the numbers together, and all the variables

4r+12=0

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

4r=-12

r=-12/4

r=-3

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