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x in (-oo:+oo)
9 = -x/8 // + -x/8
9-(-x/8) = 0
(1/8)*x+9 = 0
1/8*x+9 = 0 // - 9
1/8*x = -9 // : 1/8
x = -9/1/8
x = -72
x = -72
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