r/2-2=8

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Solution for r/2-2=8 equation: 


r in (-oo:+oo)

r/2-2 = 8 // - 8

r/2-8-2 = 0

1/2*r-10 = 0 // + 10

1/2*r = 10 // : 1/2

r = 10/1/2

r = 20

r = 20

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