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x in (-oo:+oo)
(10*x)/25 = -4/25 // + -4/25
(10*x)/25-(-4/25) = 0
(10*x)/25+4/25 = 0
2/5*x+4/25 = 0 // - 4/25
2/5*x = -4/25 // : 2/5
x = -4/25/2/5
x = -2/5
x = -2/5
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