5(3r-1)=100

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Solution for 5(3r-1)=100 equation: 



5(3r-1)=100

We move all terms to the left:

5(3r-1)-(100)=0

We multiply parentheses

15r-5-100=0

We add all the numbers together, and all the variables

15r-105=0

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

15r=105

r=105/15

r=7

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