r/2-1=1

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Solution for r/2-1=1 equation: 


r in (-oo:+oo)

r/2-1 = 1 // - 1

r/2-1-1 = 0

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

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

r = 2/1/2

r = 4

r = 4

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