4=3.2r+5

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Solution for 4=3.2r+5 equation: 



4=3.2r+5

We move all terms to the left:

4-(3.2r+5)=0

We get rid of parentheses

-3.2r-5+4=0

We add all the numbers together, and all the variables

-3.2r-1=0

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

-3.2r=1

r=1/-3.2

r=-1/3.2

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