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x in (-oo:+oo)
(-5/6)*x-(1/2) = (-5/7)*x-(14/33) // - (-5/7)*x-(14/33)
(-5/6)*x-((-5/7)*x)-(1/2)+14/33 = 0
(-5/6)*x+(5/7)*x-1/2+14/33 = 0
-5/42*x-5/66 = 0 // + 5/66
-5/42*x = 5/66 // : -5/42
x = 5/66/(-5/42)
x = -7/11
x = -7/11
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