7d-9+3d=91

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Solution for 7d-9+3d=91 equation: 


d in (-oo:+oo)

7*d+3*d-9 = 91 // - 91

7*d+3*d-91-9 = 0

10*d-100 = 0 // + 100

10*d = 100 // : 10

d = 100/10

d = 10

d = 10

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