-1=1/3r

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Solution for -1=1/3r equation: 


r in (-oo:+oo)

-1 = (1/3)*r // - (1/3)*r

-((1/3)*r)-1 = 0

(-1/3)*r-1 = 0

-1/3*r-1 = 0 // + 1

-1/3*r = 1 // : -1/3

r = 1/(-1/3)

r = -3

r = -3

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