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k in (-oo:+oo)
20 = (4*36*k)/16 // - (4*36*k)/16
20-((4*36*k)/16) = 0
20-9*k = 0
20-9*k = 0 // - 20
-9*k = -20 // : -9
k = -20/(-9)
k = 20/9
k = 20/9
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