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d in (-oo:+oo)
7*d-3*d+8/9 = -64/9 // + -64/9
7*d-3*d+8/9-(-64/9) = 0
7*d-3*d+8/9+64/9 = 0
4*d+8 = 0 // - 8
4*d = -8 // : 4
d = -8/4
d = -2
d = -2
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