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x in (-oo:+oo)
84 = (2/3)*x // - (2/3)*x
84-((2/3)*x) = 0
(-2/3)*x+84 = 0
84-2/3*x = 0 // - 84
-2/3*x = -84 // : -2/3
x = -84/(-2/3)
x = 126
x = 126
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