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x in (-oo:+oo)
(1/2)*(x-(2/9)) = 4*x-1 // - 4*x-1
(1/2)*(x-(2/9))-(4*x)+1 = 0
(1/2)*(x-2/9)-4*x+1 = 0
1/2*(x-2/9)-4*x+1 = 0
1/2*(x-2/9)-4*x+1 = 0
1-7/2*x-1/9 = 0
8/9-7/2*x = 0
8/9-7/2*x = 0
8/9-7/2*x = 0 // - 8/9
-7/2*x = -8/9 // : -7/2
x = -8/9/(-7/2)
x = 16/63
x = 16/63
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