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