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7*x+5*y = 1/6 // - 1/6
7*x+5*y-(1/6) = 0
7*x+5*y-1/6 = 0
7*x+5*y-1/6 = 0 // - 5*y-1/6
7*x = -(5*y-1/6) // : 7
x = (-(5*y-1/6))/7
x = (1/6-(5*y))/7
x = (1/6-(5*y))/7
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