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x in (-oo:+oo)
-6*x-((1/2)*x) = -2 // + 2
2-6*x-((1/2)*x) = 0
(-1/2)*x-6*x+2 = 0
2-13/2*x = 0 // - 2
-13/2*x = -2 // : -13/2
x = -2/(-13/2)
x = 4/13
x = 4/13
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