r-8.5=-2.1*

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Solution for r-8.5=-2.1* equation: 



r-8.5=-2.1*

We move all terms to the left:

r-8.5-(-2.1*)=0

We add all the numbers together, and all the variables

r-8.5-0=0

We add all the numbers together, and all the variables

r-8.5=0

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

r=8.5

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