5r+30=-75

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Solution for 5r+30=-75 equation: 



5r+30=-75

We move all terms to the left:

5r+30-(-75)=0

We add all the numbers together, and all the variables

5r+105=0

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

5r=-105

r=-105/5

r=-21

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