1/2d-4=-7 - solution

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Solution for 1/2d-4=-7 equation:

d in (-oo:+oo)

(1/2)*d-4 = -7 // + 7

(1/2)*d-4+7 = 0

1/2*d+3 = 0 // - 3

1/2*d = -3 // : 1/2

d = -3/1/2

d = -6

d = -6

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