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x in (-oo:+oo)
X/3 = (20/2)*x // - (20/2)*x
X/3-((20/2)*x) = 0
X/3-10*x = 0
1/3*X-10*x = 0 // - 1/3*X
-10*x = -(1/3*X) // : -10
x = (-(1/3*X))/(-10)
x = 1/30*X
x = 1/30*X
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