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x in (-oo:+oo)
X/3-(x/2) = 12 // - 12
X/3-(x/2)-12 = 0
1/3*X-1/2*x-12 = 0 // - 1/3*X-12
-1/2*x = -(1/3*X-12) // : -1/2
x = (-(1/3*X-12))/(-1/2)
x = -2*(12-(1/3*X))
x = -2*(12-(1/3*X))
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