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z in (-oo:+oo)
(2/5)*(25*z-30) = (3/5)*(12*z+16) // - (3/5)*(12*z+16)
(2/5)*(25*z-30)-((3/5)*(12*z+16)) = 0
(2/5)*(25*z-30)+(-3/5)*(12*z+16) = 0
2/5*(25*z-30)-3/5*(12*z+16) = 0
2/5*(25*z-30)-3/5*(12*z+16) = 0
14/5*z-108/5 = 0
14/5*z-108/5 = 0
14/5*z-108/5 = 0 // + 108/5
14/5*z = 108/5 // : 14/5
z = 108/5/14/5
z = 54/7
z = 54/7
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