(21+49r)=7

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Solution for (21+49r)=7 equation: 



(21+49r)=7

We move all terms to the left:

(21+49r)-(7)=0

We add all the numbers together, and all the variables

(49r+21)-7=0

We get rid of parentheses

49r+21-7=0

We add all the numbers together, and all the variables

49r+14=0

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

49r=-14

r=-14/49

r=-2/7

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