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