15r-18=11r-20

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Solution for 15r-18=11r-20 equation: 



15r-18=11r-20

We move all terms to the left:

15r-18-(11r-20)=0

We get rid of parentheses

15r-11r+20-18=0

We add all the numbers together, and all the variables

4r+2=0

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

4r=-2

r=-2/4

r=-1/2

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