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z in (-oo:+oo)
(8/5)*z+1/4 = (1/5)*z+7/4 // - (1/5)*z+7/4
(8/5)*z-((1/5)*z)+1/4-(7/4) = 0
(8/5)*z+(-1/5)*z+1/4-7/4 = 0
7/5*z-3/2 = 0 // + 3/2
7/5*z = 3/2 // : 7/5
z = 3/2/7/5
z = 15/14
z = 15/14
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