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x in (-oo:+oo)
(2/5)*(10*x-5) = -38 // + 38
(2/5)*(10*x-5)+38 = 0
2/5*(10*x-5)+38 = 0
2/5*(10*x-5)+38 = 0
4*x+36 = 0
4*x+36 = 0
4*x+36 = 0 // - 36
4*x = -36 // : 4
x = -36/4
x = -9
x = -9
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