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P/6+9*x = 13 // - 13
P/6+9*x-13 = 0
1/6*P+9*x-13 = 0 // - 1/6*P-13
9*x = -(1/6*P-13) // : 9
x = (-(1/6*P-13))/9
x = (13-(1/6*P))/9
x = (13-(1/6*P))/9
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