-3=-4d+d+9

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Solution for -3=-4d+d+9 equation: 


d in (-oo:+oo)

-3 = d-4*d+9 // - d-4*d+9

-(-4*d)-d-9-3 = 0

4*d-d-9-3 = 0

3*d-12 = 0 // + 12

3*d = 12 // : 3

d = 12/3

d = 4

d = 4

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