a/2-1=9

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Solution for a/2-1=9 equation: 


a in (-oo:+oo)

a/2-1 = 9 // - 9

a/2-9-1 = 0

1/2*a-10 = 0 // + 10

1/2*a = 10 // : 1/2

a = 10/1/2

a = 20

a = 20

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