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z in (-oo:+oo)
2-((3/4)*z) = (1/8)*z+9 // - (1/8)*z+9
2-((3/4)*z)-((1/8)*z)-9 = 0
(-3/4)*z+(-1/8)*z-9+2 = 0
-7/8*z-7 = 0 // + 7
-7/8*z = 7 // : -7/8
z = 7/(-7/8)
z = -8
z = -8
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