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15*x-(5*(15/7)*x)-(5/42) = 0
15*x+(-75/7)*x-5/42 = 0
30/7*x-5/42 = 0 // + 5/42
30/7*x = 5/42 // : 30/7
x = 5/42/30/7
x = 1/36
x = 1/36
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