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z in (-oo:+oo)
(3/4)*z+3/2 = -3/4 // + -3/4
(3/4)*z+3/2-(-3/4) = 0
(3/4)*z+3/2+3/4 = 0
3/4*z+9/4 = 0 // - 9/4
3/4*z = -9/4 // : 3/4
z = -9/4/3/4
z = -3
z = -3
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