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x in (-oo:+oo)
15-((5/2)*x) = (1/2)*x+9 // - (1/2)*x+9
15-((5/2)*x)-((1/2)*x)-9 = 0
(-5/2)*x+(-1/2)*x-9+15 = 0
6-3*x = 0 // - 6
-3*x = -6 // : -3
x = -6/(-3)
x = 2
x = 2
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