a/2-3=12

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Solution for a/2-3=12 equation: 


a in (-oo:+oo)

a/2-3 = 12 // - 12

a/2-12-3 = 0

1/2*a-15 = 0 // + 15

1/2*a = 15 // : 1/2

a = 15/1/2

a = 30

a = 30

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