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x in (-oo:+oo)
-4 = (7/3)*x // - (7/3)*x
-((7/3)*x)-4 = 0
(-7/3)*x-4 = 0
-7/3*x-4 = 0 // + 4
-7/3*x = 4 // : -7/3
x = 4/(-7/3)
x = -12/7
x = -12/7
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