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