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7*x+(1/3)*y = 17 // - 17
7*x+(1/3)*y-17 = 0
7*x+1/3*y-17 = 0 // - 1/3*y-17
7*x = -(1/3*y-17) // : 7
x = (-(1/3*y-17))/7
x = (17-(1/3*y))/7
x = (17-(1/3*y))/7
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