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z in (-oo:+oo)
54 = (9/4)*z // - (9/4)*z
54-((9/4)*z) = 0
(-9/4)*z+54 = 0
54-9/4*z = 0 // - 54
-9/4*z = -54 // : -9/4
z = -54/(-9/4)
z = 24
z = 24
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