5(1+4r)=85

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Solution for 5(1+4r)=85 equation: 



5(1+4r)=85

We move all terms to the left:

5(1+4r)-(85)=0

We add all the numbers together, and all the variables

5(4r+1)-85=0

We multiply parentheses

20r+5-85=0

We add all the numbers together, and all the variables

20r-80=0

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

20r=80

r=80/20

r=4

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