a/2=-20 - solution

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Solution for a/2=-20 equation:

a in (-oo:+oo)

a/2 = -20 // + 20

a/2+20 = 0

1/2*a+20 = 0 // - 20

1/2*a = -20 // : 1/2

a = -20/1/2

a = -40

a = -40

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