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z in (-oo:+oo)
(3*z)/8-7 = -3 // + 3
(3*z)/8-7+3 = 0
3/8*z-4 = 0 // + 4
3/8*z = 4 // : 3/8
z = 4/3/8
z = 32/3
z = 32/3
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