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