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7/2-((5/2)*x)-5 = 9 // - 9
7/2-((5/2)*x)-9-5 = 0
(-5/2)*x+7/2-9-5 = 0
-5/2*x-21/2 = 0 // + 21/2
-5/2*x = 21/2 // : -5/2
x = 21/2/(-5/2)
x = -21/5
x = -21/5
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