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