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z in (-oo:+oo)
(4*z)/5-(7/3) = (2*z)/3-((2*z)/3) // - (2*z)/3-((2*z)/3)
(4*z)/5-((2*z)/3)+(2*z)/3-(7/3) = 0
(4*z)/5+(-2/3)*z+(2*z)/3-7/3 = 0
4/5*z-7/3 = 0 // + 7/3
4/5*z = 7/3 // : 4/5
z = 7/3/4/5
z = 35/12
z = 35/12
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