7-5r=8+2(10-9r)

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Solution for 7-5r=8+2(10-9r) equation: 



7-5r=8+2(10-9r)

We move all terms to the left:

7-5r-(8+2(10-9r))=0

We add all the numbers together, and all the variables

-5r-(8+2(-9r+10))+7=0



We calculate terms in parentheses: -(8+2(-9r+10)), so:

8+2(-9r+10)

determiningTheFunctionDomain
2(-9r+10)+8

We multiply parentheses

-18r+20+8

We add all the numbers together, and all the variables

-18r+28

Back to the equation:

-(-18r+28)



We get rid of parentheses

-5r+18r-28+7=0

We add all the numbers together, and all the variables

13r-21=0

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

13r=21

r=21/13

r=1+8/13

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