20r+12=18r+20

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Solution for 20r+12=18r+20 equation: 



20r+12=18r+20

We move all terms to the left:

20r+12-(18r+20)=0

We get rid of parentheses

20r-18r-20+12=0

We add all the numbers together, and all the variables

2r-8=0

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

2r=8

r=8/2

r=4

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