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x in (-oo:+oo)
(-2/3)*x-x-3 = 8 // - 8
(-2/3)*x-x-8-3 = 0
-5/3*x-11 = 0 // + 11
-5/3*x = 11 // : -5/3
x = 11/(-5/3)
x = -33/5
x = -33/5
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