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x in (-oo:+oo)
-49 = (-7/3)*x // - (-7/3)*x
-((-7/3)*x)-49 = 0
(7/3)*x-49 = 0
7/3*x-49 = 0 // + 49
7/3*x = 49 // : 7/3
x = 49/7/3
x = 21
x = 21
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