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x in (-oo:+oo)
(2/5)*(x-(2/3)) = (-2/3)*(x+1/6) // - (-2/3)*(x+1/6)
(2/5)*(x-(2/3))-((-2/3)*(x+1/6)) = 0
(2/5)*(x-2/3)+(2/3)*(x+1/6) = 0
2/5*(x-2/3)+2/3*(x+1/6) = 0
2/5*(x-2/3)+2/3*(x+1/6) = 0
16/15*x-7/45 = 0
16/15*x-7/45 = 0
16/15*x-7/45 = 0 // + 7/45
16/15*x = 7/45 // : 16/15
x = 7/45/16/15
x = 7/48
x = 7/48
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