4r+19=90

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Solution for 4r+19=90 equation: 



4r+19=90

We move all terms to the left:

4r+19-(90)=0

We add all the numbers together, and all the variables

4r-71=0

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

4r=71

r=71/4

r=17+3/4

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