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x in (-oo:+oo)
(-2/5)*x+4/5 = -6/5 // + -6/5
(-2/5)*x+4/5-(-6/5) = 0
(-2/5)*x+4/5+6/5 = 0
2-2/5*x = 0 // - 2
-2/5*x = -2 // : -2/5
x = -2/(-2/5)
x = 5
x = 5
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