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15*x-(5*(15/7)*x)-(5/42) = 18 // - 18
15*x-(5*(15/7)*x)-(5/42)-18 = 0
15*x+(-75/7)*x-5/42-18 = 0
30/7*x-761/42 = 0 // + 761/42
30/7*x = 761/42 // : 30/7
x = 761/42/30/7
x = 761/180
x = 761/180
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