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z in (-oo:+oo)
(3*z)/8-7 = -2 // + 2
(3*z)/8-7+2 = 0
3/8*z-5 = 0 // + 5
3/8*z = 5 // : 3/8
z = 5/3/8
z = 40/3
z = 40/3
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