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3*x+(5/7)*x-8 = 16/7 // - 16/7
3*x+(5/7)*x-(16/7)-8 = 0
3*x+(5/7)*x-16/7-8 = 0
26/7*x-72/7 = 0 // + 72/7
26/7*x = 72/7 // : 26/7
x = 72/7/26/7
x = 36/13
x = 36/13
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