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z in (-oo:+oo)
(3/4)*(z+2/5)+2*z = 0
3/4*(z+2/5)+2*z = 0
3/4*(z+2/5)+2*z = 0
11/4*z+3/10 = 0
11/4*z+3/10 = 0
11/4*z+3/10 = 0 // - 3/10
11/4*z = -3/10 // : 11/4
z = -3/10/11/4
z = -6/55
z = -6/55
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