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x in (-oo:+oo)
1/5+1/7 = -((1/2)*x) // + (1/2)*x
(1/2)*x+1/5+1/7 = 0
1/2*x+12/35 = 0 // - 12/35
1/2*x = -12/35 // : 1/2
x = -12/35/1/2
x = -24/35
x = -24/35
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