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x in (-oo:+oo)
-7/3 = (3/8)*x // - (3/8)*x
-((3/8)*x)-7/3 = 0
(-3/8)*x-7/3 = 0
-3/8*x-7/3 = 0 // + 7/3
-3/8*x = 7/3 // : -3/8
x = 7/3/(-3/8)
x = -56/9
x = -56/9
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