21+r=-1/2

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Solution for 21+r=-1/2 equation: 


r in (-oo:+oo)

r+21 = -1/2 // + -1/2

r-(-1/2)+21 = 0

r+1/2+21 = 0

r+43/2 = 0 // - 43/2

r = -43/2

r = -43/2

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