7r-10=4r+20

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Solution for 7r-10=4r+20 equation: 



7r-10=4r+20

We move all terms to the left:

7r-10-(4r+20)=0

We get rid of parentheses

7r-4r-20-10=0

We add all the numbers together, and all the variables

3r-30=0

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

3r=30

r=30/3

r=10

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