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x in (-oo:+oo)
(2/3)*x-(1/2) = x-(3/10) // - x-(3/10)
(2/3)*x-x-(1/2)+3/10 = 0
(2/3)*x-x-1/2+3/10 = 0
-1/3*x-1/5 = 0 // + 1/5
-1/3*x = 1/5 // : -1/3
x = 1/5/(-1/3)
x = -3/5
x = -3/5
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