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x/63 - x = 4/3
x/63 - 63x/63 = 84/63
x -63x = 84
-62x = 84
x = - 84/62 = - 42/31
x/63 - x = 4/3
x/63 - 63x/63 = 84/63
x -63x = 84
-62x = 84
x = - 84/62 = - 42/31