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