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x in (-oo:+oo)
(-2/5)*x = 3/10 // - 3/10
(-2/5)*x-(3/10) = 0
(-2/5)*x-3/10 = 0
-2/5*x-3/10 = 0 // + 3/10
-2/5*x = 3/10 // : -2/5
x = 3/10/(-2/5)
x = -3/4
x = -3/4
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