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x in (-oo:+oo)
-16/21 = (-14/21)*x // - (-14/21)*x
-((-14/21)*x)-16/21 = 0
(2/3)*x-16/21 = 0
2/3*x-16/21 = 0 // + 16/21
2/3*x = 16/21 // : 2/3
x = 16/21/2/3
x = 8/7
x = 8/7
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