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x in (-oo:+oo)
-8 = (2/5)*(x-2) // - (2/5)*(x-2)
-((2/5)*(x-2))-8 = 0
(-2/5)*(x-2)-8 = 0
-2/5*(x-2)-8 = 0
-2/5*(x-2)-8 = 0
-2/5*x-36/5 = 0
-2/5*x-36/5 = 0
-2/5*x-36/5 = 0 // + 36/5
-2/5*x = 36/5 // : -2/5
x = 36/5/(-2/5)
x = -18
x = -18
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