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x in (-oo:+oo)
5-((2/3)*x) = 8 // - 8
5-((2/3)*x)-8 = 0
(-2/3)*x-8+5 = 0
-2/3*x-3 = 0 // + 3
-2/3*x = 3 // : -2/3
x = 3/(-2/3)
x = -9/2
x = -9/2
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