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635/63 = x-((2/7)*x)+10 // - x-((2/7)*x)+10
(2/7)*x-x+635/63-10 = 0
5/63-5/7*x = 0 // - 5/63
-5/7*x = -5/63 // : -5/7
x = -5/63/(-5/7)
x = 1/9
x = 1/9
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