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x in (-oo:+oo)
(1/4)*(4/9-(2*x))-(4/9) = 7/9 // - 7/9
(1/4)*(4/9-(2*x))-(4/9)-(7/9) = 0
(1/4)*(4/9-2*x)-4/9-7/9 = 0
1/4*(4/9-2*x)-4/9-7/9 = 0
(1/4*9*(4/9-2*x))/9-4/9-7/9 = 0
1/4*9*(4/9-2*x)-7-4 = 0
-9/2*x-7-3 = 0
-9/2*x-10 = 0
(-9/2*x-10)/9 = 0
(-9/2*x-10)/9 = 0 // * 9
-9/2*x-10 = 0
-9/2*x-10 = 0 // + 10
-9/2*x = 10 // : -9/2
x = 10/(-9/2)
x = -20/9
x = -20/9
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