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x in (-oo:+oo)
-8 = (x+68)/(-9) // - (x+68)/(-9)
-((x+68)/(-9))-8 = 0
(-1*(x+68))/(-9)-8 = 0
(-1*(x+68))/(-9)+(-9*(-8))/(-9) = 0
-1*(x+68)-9*(-8) = 0
4-x = 0
(4-x)/(-9) = 0
(4-x)/(-9) = 0 // * -9
4-x = 0
4-x = 0 // - 4
-x = -4 // * -1
x = 4
x = 4
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