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x in (-oo:+oo)
9-((2*x)/3) = 15 // - 15
9-((2*x)/3)-15 = 0
(-2/3)*x-15+9 = 0
-2/3*x-6 = 0 // + 6
-2/3*x = 6 // : -2/3
x = 6/(-2/3)
x = -9
x = -9
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