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X in (-oo:+oo)
12.5 = (2*X^1)/3 // - (2*X^1)/3
12.5-((2*X^1)/3) = 0
(-2/3)*X+12.5 = 0
12.5-2/3*X = 0 // - 12.5
-2/3*X = -12.5 // : -2/3
X = -12.5/(-2/3)
X = 18.74999991
X = 18.74999991
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