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x in (-oo:+oo)
-8*x-(6*x) = 7/5 // - 7/5
-8*x-(6*x)-(7/5) = 0
-8*x-6*x-7/5 = 0
-14*x-7/5 = 0 // + 7/5
-14*x = 7/5 // : -14
x = 7/5/(-14)
x = -1/10
x = -1/10
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