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x in (-oo:+oo)
-4 = (7/33)*x // - (7/33)*x
-((7/33)*x)-4 = 0
(-7/33)*x-4 = 0
-7/33*x-4 = 0 // + 4
-7/33*x = 4 // : -7/33
x = 4/(-7/33)
x = -132/7
x = -132/7
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