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89 = 2*((1/2)*w-5)+2*l // - 2*((1/2)*w-5)+2*l
89-(2*((1/2)*w-5))-(2*l) = 0
89-2*((1/2)*w-5)-2*l = 0
89-2*(1/2*w-5)-2*l = 0
89-2*(1/2*w-5)-2*l = 0
10-2*l-w+89 = 0
99-2*l-w = 0
99-2*l-w = 0
x belongs to the empty set
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