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(21/5)*x-y = 16/5 // - 16/5
(21/5)*x-y-(16/5) = 0
(21/5)*x-y-16/5 = 0
21/5*x-y-16/5 = 0 // + -y-16/5
21/5*x = -(-y-16/5) // : 21/5
x = (-(-y-16/5))/21/5
x = 5/21*(y+16/5)
x = 5/21*(y+16/5)
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