-y/3=-21

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Solution for -y/3=-21 equation: 


y in (-oo:+oo)

-y/3 = -21 // + 21

21-y/3 = 0

21-1/3*y = 0 // - 21

-1/3*y = -21 // : -1/3

y = -21/(-1/3)

y = 63

y = 63

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