7=-8r+9(2+r)

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Solution for 7=-8r+9(2+r) equation: 



7=-8r+9(2+r)

We move all terms to the left:

7-(-8r+9(2+r))=0

We add all the numbers together, and all the variables

-(-8r+9(r+2))+7=0



We calculate terms in parentheses: -(-8r+9(r+2)), so:

-8r+9(r+2)

We multiply parentheses

-8r+9r+18

We add all the numbers together, and all the variables

r+18

Back to the equation:

-(r+18)



We get rid of parentheses

-r-18+7=0

We add all the numbers together, and all the variables

-1r-11=0

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

-r=11

r=11/-1

r=-11

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