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2*x+5*x = 5/7+5 // - 5/7+5
2*x+5*x-(5/7)-5 = 0
2*x+5*x-5/7-5 = 0
7*x-40/7 = 0 // + 40/7
7*x = 40/7 // : 7
x = 40/7/7
x = 40/49
x = 40/49
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