d/4-2-1 - solution

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Solution for d/4-2-1 equation:

d in (-oo:+oo)

d/4-2 > -1 // + 1

d/4-2+1 > 0

1/4*d-1 > 0 // + 1

1/4*d > 1 // : 1/4

d > 1/1/4

d > 4

d in (4:+oo)

(4:+oo)

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