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q in (-oo:+oo)
q/2.78 = 9 // - 9
q/2.78-9 = 0
0.35971223*q-9 = 0 // + 9
0.35971223*q = 9 // : 0.35971223
q = 9/0.35971223
q = 25.02000002
q = 25.02000002
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