-1=-1/2r - solution

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

r in (-oo:+oo)

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

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

(1/2)*r-1 = 0

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

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

r = 1/1/2

r = 2

r = 2

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