3(r-50)=66

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Solution for 3(r-50)=66 equation: 



3(r-50)=66

We move all terms to the left:

3(r-50)-(66)=0

We multiply parentheses

3r-150-66=0

We add all the numbers together, and all the variables

3r-216=0

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

3r=216

r=216/3

r=72

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