D/4=7 - solution

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Solution for D/4=7 equation:

D in (-oo:+oo)

D/4 = 7 // - 7

D/4-7 = 0

1/4*D-7 = 0 // + 7

1/4*D = 7 // : 1/4

D = 7/1/4

D = 28

D = 28

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