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11-((4*x)/5) = 9 // - 9
11-((4*x)/5)-9 = 0
(-4/5)*x-9+11 = 0
2-4/5*x = 0 // - 2
-4/5*x = -2 // : -4/5
x = -2/(-4/5)
x = 5/2
x = 5/2
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