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x in (-oo:+oo)
(7/8)*x-(1/15) = (-1/8)*x-(2/5) // - (-1/8)*x-(2/5)
(7/8)*x-((-1/8)*x)-(1/15)+2/5 = 0
(7/8)*x+(1/8)*x-1/15+2/5 = 0
x+1/3 = 0 // - 1/3
x = -1/3
x = -1/3
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