39=-y/2

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Solution for 39=-y/2 equation: 


y in (-oo:+oo)

39 = -y/2 // + -y/2

39-(-y/2) = 0

(1/2)*y+39 = 0

1/2*y+39 = 0 // - 39

1/2*y = -39 // : 1/2

y = -39/1/2

y = -78

y = -78

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