15+r=5(2+4r)-9r

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Solution for 15+r=5(2+4r)-9r equation: 



15+r=5(2+4r)-9r

We move all terms to the left:

15+r-(5(2+4r)-9r)=0

We add all the numbers together, and all the variables

r-(5(4r+2)-9r)+15=0



We calculate terms in parentheses: -(5(4r+2)-9r), so:

5(4r+2)-9r

We add all the numbers together, and all the variables

-9r+5(4r+2)

We multiply parentheses

-9r+20r+10

We add all the numbers together, and all the variables

11r+10

Back to the equation:

-(11r+10)



We get rid of parentheses

r-11r-10+15=0

We add all the numbers together, and all the variables

-10r+5=0

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

-10r=-5

r=-5/-10

r=1/2

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