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x in (-oo:+oo)
(-5/2)*x = -3/8 // + -3/8
(-5/2)*x-(-3/8) = 0
(-5/2)*x+3/8 = 0
3/8-5/2*x = 0 // - 3/8
-5/2*x = -3/8 // : -5/2
x = -3/8/(-5/2)
x = 3/20
x = 3/20
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