-2d+7+d=4

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Solution for -2d+7+d=4 equation: 


d in (-oo:+oo)

d-2*d+7 = 4 // - 4

d-2*d-4+7 = 0

3-d = 0 // - 3

-d = -3 // * -1

d = 3

d = 3

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