12-3r=3(4-r)

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



12-3r=3(4-r)

We move all terms to the left:

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

We add all the numbers together, and all the variables

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



We calculate terms in parentheses: -(3(-1r+4)), so:

3(-1r+4)

We multiply parentheses

-3r+12

Back to the equation:

-(-3r+12)



We get rid of parentheses

-3r+3r-12+12=0

We add all the numbers together, and all the variables

=0

r=0/1

r=0

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