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z in (-oo:+oo)
(3*z)/10-6 = -7 // + 7
(3*z)/10-6+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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