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