7(-3-6r)=7(-r+12)

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Solution for 7(-3-6r)=7(-r+12) equation: 



7(-3-6r)=7(-r+12)

We move all terms to the left:

7(-3-6r)-(7(-r+12))=0

We add all the numbers together, and all the variables

7(-6r-3)-(7(-1r+12))=0

We multiply parentheses

-42r-(7(-1r+12))-21=0



We calculate terms in parentheses: -(7(-1r+12)), so:

7(-1r+12)

We multiply parentheses

-7r+84

Back to the equation:

-(-7r+84)



We get rid of parentheses

-42r+7r-84-21=0

We add all the numbers together, and all the variables

-35r-105=0

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

-35r=105

r=105/-35

r=-3

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