a/2-1/2=4 - solution

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

a in (-oo:+oo)

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

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

a/2-1/2-4 = 0

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

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

a = 9/2/1/2

a = 9

a = 9

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