3(r-10)=90+9r

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Solution for 3(r-10)=90+9r equation: 



3(r-10)=90+9r

We move all terms to the left:

3(r-10)-(90+9r)=0

We add all the numbers together, and all the variables

3(r-10)-(9r+90)=0

We multiply parentheses

3r-(9r+90)-30=0

We get rid of parentheses

3r-9r-90-30=0

We add all the numbers together, and all the variables

-6r-120=0

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

-6r=120

r=120/-6

r=-20

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