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x in (-oo:+oo)
-10*x-(12/(-7)) = 14 // - 14
-10*x-(12/(-7))-14 = 0
12/7-10*x-14 = 0
-10*x-86/7 = 0 // + 86/7
-10*x = 86/7 // : -10
x = 86/7/(-10)
x = -43/35
x = -43/35
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