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x in (-oo:+oo)
(2/5)*(2-x) = (1/6)*(2-2*x) // - (1/6)*(2-2*x)
(2/5)*(2-x)-((1/6)*(2-2*x)) = 0
(2/5)*(2-x)+(-1/6)*(2-2*x) = 0
2/5*(2-x)-1/6*(2-2*x) = 0
2/5*(2-x)-1/6*(2-2*x) = 0
7/15-1/15*x = 0
7/15-1/15*x = 0
7/15-1/15*x = 0 // - 7/15
-1/15*x = -7/15 // : -1/15
x = -7/15/(-1/15)
x = 7
x = 7
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