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(2/7)*x = 5-((1/7)*x) // - 5-((1/7)*x)
(2/7)*x+(1/7)*x-5 = 0
3/7*x-5 = 0 // + 5
3/7*x = 5 // : 3/7
x = 5/3/7
x = 35/3
x = 35/3
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