r*3+r*2=20+15

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Solution for r*3+r*2=20+15 equation: 



r*3+r*2=20+15

We move all terms to the left:

r*3+r*2-(20+15)=0

We add all the numbers together, and all the variables

r*3+r*2-35=0

Wy multiply elements

3r+2r-35=0

We add all the numbers together, and all the variables

5r-35=0

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

5r=35

r=35/5

r=7

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