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