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x in (-oo:+oo)
x/21 = 27/9 // - 27/9
x/21-(27/9) = 0
x/21-3 = 0
1/21*x-3 = 0 // + 3
1/21*x = 3 // : 1/21
x = 3/1/21
x = 63
x = 63
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