19.12=-8.9r

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Solution for 19.12=-8.9r equation: 



19.12=-8.9r

We move all terms to the left:

19.12-(-8.9r)=0

We get rid of parentheses

8.9r+19.12=0

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

8.9r=-19.12

r=-19.12/8.9

r=-2+1/6.7424242424242

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