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x in (-oo:+oo)
A/2 = 6*x // - 6*x
A/2-(6*x) = 0
A/2-6*x = 0
1/2*A-6*x = 0 // - 1/2*A
-6*x = -(1/2*A) // : -6
x = (-(1/2*A))/(-6)
x = 1/12*A
x = 1/12*A
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