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z in (-oo:+oo)
7/3 = (-5/2)*z // - (-5/2)*z
7/3-((-5/2)*z) = 0
(5/2)*z+7/3 = 0
5/2*z+7/3 = 0 // - 7/3
5/2*z = -7/3 // : 5/2
z = -7/3/5/2
z = -14/15
z = -14/15
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