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z in (-oo:+oo)
11/2 = (4/15)*z+7/2 // - (4/15)*z+7/2
11/2-((4/15)*z)-(7/2) = 0
(-4/15)*z+11/2-7/2 = 0
2-4/15*z = 0 // - 2
-4/15*z = -2 // : -4/15
z = -2/(-4/15)
z = 15/2
z = 15/2
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