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z in (-oo:+oo)
(-1/5)*z+9 = (1/5)*z+6 // - (1/5)*z+6
(-1/5)*z-((1/5)*z)-6+9 = 0
(-1/5)*z+(-1/5)*z-6+9 = 0
3-2/5*z = 0 // - 3
-2/5*z = -3 // : -2/5
z = -3/(-2/5)
z = 15/2
z = 15/2
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