5(r-1)+4(r+2)=75

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Solution for 5(r-1)+4(r+2)=75 equation: 



5(r-1)+4(r+2)=75

We move all terms to the left:

5(r-1)+4(r+2)-(75)=0

We multiply parentheses

5r+4r-5+8-75=0

We add all the numbers together, and all the variables

9r-72=0

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

9r=72

r=72/9

r=8

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