7-d-3d=11

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Solution for 7-d-3d=11 equation: 


d in (-oo:+oo)

7-d-(3*d) = 11 // - 11

7-d-(3*d)-11 = 0

7-d-3*d-11 = 0

-4*d-4 = 0 // + 4

-4*d = 4 // : -4

d = 4/(-4)

d = -1

d = -1

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