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5*x+5*x+9/4-(1/7) = 8 // - 8
5*x+5*x+9/4-(1/7)-8 = 0
5*x+5*x+9/4-1/7-8 = 0
10*x-165/28 = 0 // + 165/28
10*x = 165/28 // : 10
x = 165/28/10
x = 33/56
x = 33/56
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