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x in (-oo:+oo)
-(5*x)-1/2 = 6 // - 6
-(5*x)-1/2-6 = 0
-5*x-1/2-6 = 0
-5*x-13/2 = 0 // + 13/2
-5*x = 13/2 // : -5
x = 13/2/(-5)
x = -13/10
x = -13/10
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