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z in (-oo:+oo)
3*z-((3/4)*z)-4 = 0
3*z+(-3/4)*z-4 = 0
9/4*z-4 = 0 // + 4
9/4*z = 4 // : 9/4
z = 4/9/4
z = 16/9
z = 16/9
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