7r-1=89-3r

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Solution for 7r-1=89-3r equation: 



7r-1=89-3r

We move all terms to the left:

7r-1-(89-3r)=0

We add all the numbers together, and all the variables

7r-(-3r+89)-1=0

We get rid of parentheses

7r+3r-89-1=0

We add all the numbers together, and all the variables

10r-90=0

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

10r=90

r=90/10

r=9

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