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q in (-oo:+oo)
1-((4/5)*q) = -19 // + 19
1-((4/5)*q)+19 = 0
(-4/5)*q+1+19 = 0
20-4/5*q = 0 // - 20
-4/5*q = -20 // : -4/5
q = -20/(-4/5)
q = 25
q = 25
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