7r+2r-4=(7+2)r-4

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Solution for 7r+2r-4=(7+2)r-4 equation: 



7r+2r-4=(7+2)r-4

We move all terms to the left:

7r+2r-4-((7+2)r-4)=0

We add all the numbers together, and all the variables

7r+2r-(9r-4)-4=0

We add all the numbers together, and all the variables

9r-(9r-4)-4=0

We get rid of parentheses

9r-9r+4-4=0

We add all the numbers together, and all the variables

=0

r=0/1

r=0

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