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x in (-oo:+oo)
(-9/2)*x-9 = -x-8 // + -x-8
(-9/2)*x+x-9+8 = 0
-7/2*x-1 = 0 // + 1
-7/2*x = 1 // : -7/2
x = 1/(-7/2)
x = -2/7
x = -2/7
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