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z in (-oo:+oo)
(3/4)*z+1/2 = -5/2 // + -5/2
(3/4)*z+1/2-(-5/2) = 0
(3/4)*z+1/2+5/2 = 0
3/4*z+3 = 0 // - 3
3/4*z = -3 // : 3/4
z = -3/3/4
z = -4
z = -4
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