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