5/21=-y/7

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Solution for 5/21=-y/7 equation: 


y in (-oo:+oo)

5/21 = -y/7 // + -y/7

5/21-(-y/7) = 0

(1/7)*y+5/21 = 0

1/7*y+5/21 = 0 // - 5/21

1/7*y = -5/21 // : 1/7

y = -5/21/1/7

y = -5/3

y = -5/3

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