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11-((2/5)*x) = 5 // - 5
11-((2/5)*x)-5 = 0
(-2/5)*x-5+11 = 0
6-2/5*x = 0 // - 6
-2/5*x = -6 // : -2/5
x = -6/(-2/5)
x = 15
x = 15
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