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