7(2r-1)-7r=-21+5r

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Solution for 7(2r-1)-7r=-21+5r equation: 



7(2r-1)-7r=-21+5r

We move all terms to the left:

7(2r-1)-7r-(-21+5r)=0

We add all the numbers together, and all the variables

7(2r-1)-7r-(5r-21)=0

We add all the numbers together, and all the variables

-7r+7(2r-1)-(5r-21)=0

We multiply parentheses

-7r+14r-(5r-21)-7=0

We get rid of parentheses

-7r+14r-5r+21-7=0

We add all the numbers together, and all the variables

2r+14=0

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

2r=-14

r=-14/2

r=-7

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