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x in (-oo:+oo)
(-2/5)*x = -3 // + 3
(-2/5)*x+3 = 0
3-2/5*x = 0 // - 3
-2/5*x = -3 // : -2/5
x = -3/(-2/5)
x = 15/2
x = 15/2
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