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15-((5/2)*x) = 1/2+9 // - 1/2+9
15-((5/2)*x)-(1/2)-9 = 0
(-5/2)*x-1/2-9+15 = 0
11/2-5/2*x = 0 // - 11/2
-5/2*x = -11/2 // : -5/2
x = -11/2/(-5/2)
x = 11/5
x = 11/5
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