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x in (-oo:+oo)
0.7*z+0.1*z+1.9 = (1/4)*(2*y+20) // - (1/4)*(2*y+20)
0.7*z-((1/4)*(2*y+20))+0.1*z+1.9 = 0
(-1/4)*(2*y+20)+0.7*z+0.1*z+1.9 = 0
0.7*z-1/4*(2*y+20)+0.1*z+1.9 = 0
0.7*z-1/4*(2*y+20)+0.1*z+1.9 = 0
0.7*z-1/2*y+0.1*z-5+1.9 = 0
0.8*z-1/2*y-5+1.9 = 0
0.8*z-1/2*y-3.1 = 0
0.8*z-1/2*y-3.1 = 0
x belongs to the empty set
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