7+5-7r=(-9)-10r

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Solution for 7+5-7r=(-9)-10r equation: 



7+5-7r=(-9)-10r

We move all terms to the left:

7+5-7r-((-9)-10r)=0

We add all the numbers together, and all the variables

-7r-((-9)-10r)+12=0



We calculate terms in parentheses: -((-9)-10r), so:

(-9)-10r

determiningTheFunctionDomain
-10r+(-9)

We add all the numbers together, and all the variables

-10r-9

Back to the equation:

-(-10r-9)



We get rid of parentheses

-7r+10r+9+12=0

We add all the numbers together, and all the variables

3r+21=0

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

3r=-21

r=-21/3

r=-7

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