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X in (-oo:+oo)
(1/2)*(X/3) = 15 // - 15
(1/2)*(X/3)-15 = 0
1/6*X-15 = 0 // + 15
1/6*X = 15 // : 1/6
X = 15/1/6
X = 90
X = 90
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