9+2d=7d-11

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Solution for 9+2d=7d-11 equation: 


d in (-oo:+oo)

2*d+9 = 7*d-11 // - 7*d-11

2*d-(7*d)+9+11 = 0

2*d-7*d+9+11 = 0

20-5*d = 0 // - 20

-5*d = -20 // : -5

d = -20/(-5)

d = 4

d = 4

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