3(r+1.8)+4.5r=39.15

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Solution for 3(r+1.8)+4.5r=39.15 equation: 



3(r+1.8)+4.5r=39.15

We move all terms to the left:

3(r+1.8)+4.5r-(39.15)=0

We add all the numbers together, and all the variables

4.5r+3(r+1.8)-39.15=0

We multiply parentheses

4.5r+3r+5.4-39.15=0

We add all the numbers together, and all the variables

7.5r-33.75=0

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

7.5r=33.75

r=33.75/7.5

r=4+2.14285714286/4.28571428571

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