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x in (-oo:+oo)
7-((2/3)*x) = x-8 // - x-8
7-((2/3)*x)-x+8 = 0
(-2/3)*x-x+7+8 = 0
15-5/3*x = 0 // - 15
-5/3*x = -15 // : -5/3
x = -15/(-5/3)
x = 9
x = 9
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