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x in (-oo:+oo)
-8 = x/5+2 // - x/5+2
-(x/5)-8-2 = 0
-1/5*x-10 = 0 // + 10
-1/5*x = 10 // : -1/5
x = 10/(-1/5)
x = -50
x = -50
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