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z in (-oo:+oo)
(3/4)*z = -131/2 // + -131/2
(3/4)*z-(-131/2) = 0
(3/4)*z+131/2 = 0
3/4*z+131/2 = 0 // - 131/2
3/4*z = -131/2 // : 3/4
z = -131/2/3/4
z = -262/3
z = -262/3
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