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(2/7)*x-5 = 15-((3/7)*x) // - 15-((3/7)*x)
(2/7)*x+(3/7)*x-15-5 = 0
5/7*x-20 = 0 // + 20
5/7*x = 20 // : 5/7
x = 20/5/7
x = 28
x = 28
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