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