1/2(d+9)=-12

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Solution for 1/2(d+9)=-12 equation: 


d in (-oo:+oo)

(1/2)*(d+9) = -12 // + 12

(1/2)*(d+9)+12 = 0

1/2*(d+9)+12 = 0

1/2*(d+9)+12 = 0

1/2*d+33/2 = 0

1/2*d+33/2 = 0

1/2*d+33/2 = 0 // - 33/2

1/2*d = -33/2 // : 1/2

d = -33/2/1/2

d = -33

d = -33

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