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x in (-oo:+oo)
X/2+(2*x)/3 = 10 // - 10
X/2+(2*x)/3-10 = 0
1/2*X+2/3*x-10 = 0 // - 1/2*X-10
2/3*x = -(1/2*X-10) // : 2/3
x = (-(1/2*X-10))/2/3
x = 3/2*(10-(1/2*X))
x = 3/2*(10-(1/2*X))
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