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x in (-oo:+oo)
(2/3)*(4.5-(1.5*x)) = 1/9 // - 1/9
(2/3)*(4.5-(1.5*x))-(1/9) = 0
(2/3)*(4.5-1.5*x)-1/9 = 0
2/3*(4.5-1.5*x)-1/9 = 0
(2/3*9*(4.5-1.5*x))/9-1/9 = 0
2/3*9*(4.5-1.5*x)-1 = 0
26.000000135-9.000000045*x = 0
(26.000000135-9.000000045*x)/9 = 0
(26.000000135-9.000000045*x)/9 = 0 // * 9
26.000000135-9.000000045*x = 0
26.000000135-9.000000045*x = 0 // - 26.000000135
-9.000000045*x = -26.000000135 // : -9.000000045
x = -26.000000135/(-9.000000045)
x = 2.88888889
x = 2.88888889
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