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x in (-oo:+oo)
X/12-8 = x/11 // - x/11
X/12-(x/11)-8 = 0
1/12*X-1/11*x-8 = 0 // - 1/12*X-8
-1/11*x = -(1/12*X-8) // : -1/11
x = (-(1/12*X-8))/(-1/11)
x = -11*(8-(1/12*X))
x = -11*(8-(1/12*X))
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