12-1/2r=2-1/2

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Solution for 12-1/2r=2-1/2 equation: 


r in (-oo:+oo)

12-((1/2)*r) = 2-(1/2) // - 2-(1/2)

1/2-((1/2)*r)-2+12 = 0

(-1/2)*r+1/2-2+12 = 0

21/2-1/2*r = 0 // - 21/2

-1/2*r = -21/2 // : -1/2

r = -21/2/(-1/2)

r = 21

r = 21

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