5+r/-3=12

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Solution for 5+r/-3=12 equation: 


r in (-oo:+oo)

r/(-3)+5 = 12 // - 12

r/(-3)-12+5 = 0

-1/3*r-7 = 0 // + 7

-1/3*r = 7 // : -1/3

r = 7/(-1/3)

r = -21

r = -21

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