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x in (-oo:+oo)
(1/4)*(5/9-(4*x))-(2/9) = 4/9 // - 4/9
(1/4)*(5/9-(4*x))-(2/9)-(4/9) = 0
(1/4)*(5/9-4*x)-2/9-4/9 = 0
1/4*(5/9-4*x)-2/9-4/9 = 0
(1/4*9*(5/9-4*x))/9-2/9-4/9 = 0
1/4*9*(5/9-4*x)-4-2 = 0
-9*x-4-3/4 = 0
-9*x-19/4 = 0
(-9*x-19/4)/9 = 0
(-9*x-19/4)/9 = 0 // * 9
-9*x-19/4 = 0
-9*x-19/4 = 0 // + 19/4
-9*x = 19/4 // : -9
x = 19/4/(-9)
x = -19/36
x = -19/36
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