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