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x in (-oo:+oo)
(1/2)*(9*x-9) = (9/2)*x-t+9 // - (9/2)*x-t+9
(1/2)*(9*x-9)+t-((9/2)*x)-9 = 0
(1/2)*(9*x-9)+t+(-9/2)*x-9 = 0
1/2*(9*x-9)+t+(-9*x)/2-9 = 0
(1/2*2*(9*x-9))/2+(2*t)/2+(-9*x)/2+(-9*2)/2 = 0
1/2*2*(9*x-9)+2*t-9*x-9*2 = 0
2*t+9*x-9*x-18-9 = 0
2*t-18-9 = 0
2*t-27 = 0
(2*t-27)/2 = 0
(2*t-27)/2 = 0 // * 2
2*t-27 = 0
x belongs to the empty set
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