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x/5+3*y = 69/5 // - 69/5
x/5+3*y-(69/5) = 0
x/5+3*y-69/5 = 0
1/5*x+3*y-69/5 = 0 // - 3*y-69/5
1/5*x = -(3*y-69/5) // : 1/5
x = (-(3*y-69/5))/1/5
x = 5*(69/5-(3*y))
x = 5*(69/5-(3*y))
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