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6*x+(3/7)*x+1 = 89/14 // - 89/14
6*x+(3/7)*x-(89/14)+1 = 0
6*x+(3/7)*x-89/14+1 = 0
45/7*x-75/14 = 0 // + 75/14
45/7*x = 75/14 // : 45/7
x = 75/14/45/7
x = 5/6
x = 5/6
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