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9-((2*x)/7) = 5 // - 5
9-((2*x)/7)-5 = 0
(-2/7)*x-5+9 = 0
4-2/7*x = 0 // - 4
-2/7*x = -4 // : -2/7
x = -4/(-2/7)
x = 14
x = 14
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