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9-((2*x)/7) = 3 // - 3
9-((2*x)/7)-3 = 0
(-2/7)*x-3+9 = 0
6-2/7*x = 0 // - 6
-2/7*x = -6 // : -2/7
x = -6/(-2/7)
x = 21
x = 21
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