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x in (-oo:+oo)
(-1/3)*x-14 = 4*x // - 4*x
(-1/3)*x-(4*x)-14 = 0
(-1/3)*x-4*x-14 = 0
-13/3*x-14 = 0 // + 14
-13/3*x = 14 // : -13/3
x = 14/(-13/3)
x = -42/13
x = -42/13
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