1/2y=-21 - solution

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Solution for 1/2y=-21 equation:

y in (-oo:+oo)

(1/2)*y = -21 // + 21

(1/2)*y+21 = 0

1/2*y+21 = 0 // - 21

1/2*y = -21 // : 1/2

y = -21/1/2

y = -42

y = -42

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