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z in (-oo:+oo)
4-((3/4)*z) = -2 // + 2
2-((3/4)*z)+4 = 0
(-3/4)*z+2+4 = 0
6-3/4*z = 0 // - 6
-3/4*z = -6 // : -3/4
z = -6/(-3/4)
z = 8
z = 8
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