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z in (-oo:+oo)
(-1/4)*z = -4.5 // + 4.5
(-1/4)*z+4.5 = 0
4.5-1/4*z = 0 // - 4.5
-1/4*z = -4.5 // : -1/4
z = -4.5/(-1/4)
z = 18
z = 18
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