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x in (-oo:+oo)
-11 = (2/5)*x-8 // - (2/5)*x-8
8-((2/5)*x)-11 = 0
(-2/5)*x-11+8 = 0
-2/5*x-3 = 0 // + 3
-2/5*x = 3 // : -2/5
x = 3/(-2/5)
x = -15/2
x = -15/2
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