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(2/7)*x-9 = (5/7)*x-15 // - (5/7)*x-15
(2/7)*x-((5/7)*x)-9+15 = 0
(2/7)*x+(-5/7)*x-9+15 = 0
6-3/7*x = 0 // - 6
-3/7*x = -6 // : -3/7
x = -6/(-3/7)
x = 14
x = 14
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