1/2a20

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Solution for 1/2a20 equation: 


a in (-oo:+oo)

(1/2)*a < 20 // - 20

(1/2)*a-20 < 0

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

1/2*a < 20 // : 1/2

a < 20/1/2

a < 40

a in (-oo:40)

(-oo:40)

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