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x in (-oo:+oo)
(-1/5)*(x+2) = 8 // - 8
(-1/5)*(x+2)-8 = 0
-1/5*(x+2)-8 = 0
-1/5*(x+2)-8 = 0
-1/5*x-42/5 = 0
-1/5*x-42/5 = 0
-1/5*x-42/5 = 0 // + 42/5
-1/5*x = 42/5 // : -1/5
x = 42/5/(-1/5)
x = -42
x = -42
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