15r+3r+4r+20r=4

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Solution for 15r+3r+4r+20r=4 equation: 



15r+3r+4r+20r=4

We move all terms to the left:

15r+3r+4r+20r-(4)=0

We add all the numbers together, and all the variables

42r-4=0

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

42r=4

r=4/42

r=2/21

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