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d in (-oo:+oo)
5*d+4*d-7/9 = -109/36 // + -109/36
5*d+4*d-7/9-(-109/36) = 0
5*d+4*d-7/9+109/36 = 0
9*d+9/4 = 0 // - 9/4
9*d = -9/4 // : 9
d = -9/4/9
d = -1/4
d = -1/4
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