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x in (-oo:+oo)
(2/5)*x+1/8 = (-3/5)*x-(2/8) // - (-3/5)*x-(2/8)
(2/5)*x-((-3/5)*x)+1/8+2/8 = 0
(2/5)*x+(3/5)*x+1/8+2/8 = 0
x+3/8 = 0 // - 3/8
x = -3/8
x = -3/8
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