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z in (-oo:+oo)
(3*z)/10-8 = -7 // + 7
(3*z)/10-8+7 = 0
3/10*z-1 = 0 // + 1
3/10*z = 1 // : 3/10
z = 1/3/10
z = 10/3
z = 10/3
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