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z in (-oo:+oo)
(4*z)/5 = -7/20 // + -7/20
(4*z)/5-(-7/20) = 0
(4*z)/5+7/20 = 0
4/5*z+7/20 = 0 // - 7/20
4/5*z = -7/20 // : 4/5
z = -7/20/4/5
z = -7/16
z = -7/16
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