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x in (-oo:+oo)
(-2/5)*x = 6/9 // - 6/9
(-2/5)*x-(6/9) = 0
(-2/5)*x-2/3 = 0
-2/5*x-2/3 = 0 // + 2/3
-2/5*x = 2/3 // : -2/5
x = 2/3/(-2/5)
x = -5/3
x = -5/3
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