0.5r=-2

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Solution for 0.5r=-2 equation: 



0.5r=-2

We move all terms to the left:

0.5r-(-2)=0

We add all the numbers together, and all the variables

0.5r+2=0

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

0.5r=-2

r=-2/0.5

r=-4

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