d-9=-d+9

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


d in (-oo:+oo)

d-9 = 9-d // - 9-d

d+d-9-9 = 0

2*d-18 = 0 // + 18

2*d = 18 // : 2

d = 18/2

d = 9

d = 9

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