21=-y/5 - solution

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Solution for 21=-y/5 equation:

y in (-oo:+oo)

21 = -y/5 // + -y/5

21-(-y/5) = 0

(1/5)*y+21 = 0

1/5*y+21 = 0 // - 21

1/5*y = -21 // : 1/5

y = -21/1/5

y = -105

y = -105

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