-12+2r=7(1+3r)

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Solution for -12+2r=7(1+3r) equation: 



-12+2r=7(1+3r)

We move all terms to the left:

-12+2r-(7(1+3r))=0

We add all the numbers together, and all the variables

2r-(7(3r+1))-12=0



We calculate terms in parentheses: -(7(3r+1)), so:

7(3r+1)

We multiply parentheses

21r+7

Back to the equation:

-(21r+7)



We get rid of parentheses

2r-21r-7-12=0

We add all the numbers together, and all the variables

-19r-19=0

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

-19r=19

r=19/-19

r=-1

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