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x in (-oo:+oo)
(-2/5)*x = -6/25 // + -6/25
(-2/5)*x-(-6/25) = 0
(-2/5)*x+6/25 = 0
6/25-2/5*x = 0 // - 6/25
-2/5*x = -6/25 // : -2/5
x = -6/25/(-2/5)
x = 3/5
x = 3/5
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