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(21/10)*x = 223/30 // - 223/30
(21/10)*x-(223/30) = 0
(21/10)*x-223/30 = 0
21/10*x-223/30 = 0 // + 223/30
21/10*x = 223/30 // : 21/10
x = 223/30/21/10
x = 223/63
x = 223/63
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