1/2a-3=7

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Solution for 1/2a-3=7 equation: 


a in (-oo:+oo)

(1/2)*a-3 = 7 // - 7

(1/2)*a-7-3 = 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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