15r+2r+r+2r=10

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Solution for 15r+2r+r+2r=10 equation:



15r+2r+r+2r=10
We move all terms to the left:
15r+2r+r+2r-(10)=0
We add all the numbers together, and all the variables
20r-10=0
We move all terms containing r to the left, all other terms to the right
20r=10
r=10/20
r=1/2

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