1/2a-4=5

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Solution for 1/2a-4=5 equation: 


a in (-oo:+oo)

(1/2)*a-4 = 5 // - 5

(1/2)*a-5-4 = 0

1/2*a-9 = 0 // + 9

1/2*a = 9 // : 1/2

a = 9/1/2

a = 18

a = 18

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