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z in (-oo:+oo)
(6/5)*(10*z+15) = -6 // + 6
(6/5)*(10*z+15)+6 = 0
6/5*(10*z+15)+6 = 0
6/5*(10*z+15)+6 = 0
12*z+24 = 0
12*z+24 = 0
12*z+24 = 0 // - 24
12*z = -24 // : 12
z = -24/12
z = -2
z = -2
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