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z in (-oo:+oo)
6*z-((1/2)*(2*z+20))+8 = 18 // - 18
6*z-((1/2)*(2*z+20))-18+8 = 0
(-1/2)*(2*z+20)+6*z-18+8 = 0
6*z-1/2*(2*z+20)-18+8 = 0
6*z-1/2*(2*z+20)-18+8 = 0
5*z-18-10+8 = 0
5*z-28+8 = 0
5*z-20 = 0
5*z-20 = 0
5*z-20 = 0 // + 20
5*z = 20 // : 5
z = 20/5
z = 4
z = 4
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