r/2=-10

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Solution for r/2=-10 equation: 



r/2=-10

We move all terms to the left:

r/2-(-10)=0

We add all the numbers together, and all the variables

r/2+10=0

We multiply all the terms by the denominator


r+10*2=0

We add all the numbers together, and all the variables

r+20=0

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

r=-20

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