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z in (-oo:+oo)
3-((3/4)*z) = -6 // + 6
3-((3/4)*z)+6 = 0
(-3/4)*z+3+6 = 0
9-3/4*z = 0 // - 9
-3/4*z = -9 // : -3/4
z = -9/(-3/4)
z = 12
z = 12
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