10.5=2.1r

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Solution for 10.5=2.1r equation: 



10.5=2.1r

We move all terms to the left:

10.5-(2.1r)=0

We add all the numbers together, and all the variables

-(+2.1r)+10.5=0

We get rid of parentheses

-2.1r+10.5=0

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

-2.1r=-10.5

r=-10.5/-2.1

r=+5

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