1+4r=9

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Solution for 1+4r=9 equation: 



1+4r=9

We move all terms to the left:

1+4r-(9)=0

We add all the numbers together, and all the variables

4r-8=0

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

4r=8

r=8/4

r=2

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