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x in (-oo:+oo)
-((2/5)*(2*x-1)) = 6 // - 6
-((2/5)*(2*x-1))-6 = 0
(-2/5)*(2*x-1)-6 = 0
-2/5*(2*x-1)-6 = 0
-2/5*(2*x-1)-6 = 0
-4/5*x-28/5 = 0
-4/5*x-28/5 = 0
-4/5*x-28/5 = 0 // + 28/5
-4/5*x = 28/5 // : -4/5
x = 28/5/(-4/5)
x = -7
x = -7
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