3r-12=-4(1-r)

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Solution for 3r-12=-4(1-r) equation: 



3r-12=-4(1-r)

We move all terms to the left:

3r-12-(-4(1-r))=0

We add all the numbers together, and all the variables

3r-(-4(-1r+1))-12=0



We calculate terms in parentheses: -(-4(-1r+1)), so:

-4(-1r+1)

We multiply parentheses

4r-4

Back to the equation:

-(4r-4)



We get rid of parentheses

3r-4r+4-12=0

We add all the numbers together, and all the variables

-1r-8=0

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

-r=8

r=8/-1

r=-8

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