5(1-r)=21+3r

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Solution for 5(1-r)=21+3r equation: 



5(1-r)=21+3r

We move all terms to the left:

5(1-r)-(21+3r)=0

We add all the numbers together, and all the variables

5(-1r+1)-(3r+21)=0

We multiply parentheses

-5r-(3r+21)+5=0

We get rid of parentheses

-5r-3r-21+5=0

We add all the numbers together, and all the variables

-8r-16=0

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

-8r=16

r=16/-8

r=-2

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