7(r-1)=-15+8r

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Solution for 7(r-1)=-15+8r equation: 



7(r-1)=-15+8r

We move all terms to the left:

7(r-1)-(-15+8r)=0

We add all the numbers together, and all the variables

7(r-1)-(8r-15)=0

We multiply parentheses

7r-(8r-15)-7=0

We get rid of parentheses

7r-8r+15-7=0

We add all the numbers together, and all the variables

-1r+8=0

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

-r=-8

r=-8/-1

r=+8

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