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x in (-oo:+oo)
z = (x-10)/8 // - (x-10)/8
z-((x-10)/8) = 0
(-1*(x-10))/8+z = 0
(-1*(x-10))/8+(8*z)/8 = 0
8*z-1*(x-10) = 0
8*z-x+10 = 0
(8*z-x+10)/8 = 0
(8*z-x+10)/8 = 0 // * 8
8*z-x+10 = 0
8*z-x+10 = 0 // - 8*z+10
-x = -(8*z+10) // * -1
x = 8*z+10
x = 8*z+10
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