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x in (-oo:+oo)
-x-6 = (1/2)*x-135/22 // - (1/2)*x-135/22
-x-((1/2)*x)-(-135/22)-6 = 0
(-1/2)*x-x+135/22-6 = 0
3/22-3/2*x = 0 // - 3/22
-3/2*x = -3/22 // : -3/2
x = -3/22/(-3/2)
x = 1/11
x = 1/11
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