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x in (-oo:+oo)
x/21 = 9/14 // - 9/14
x/21-(9/14) = 0
x/21-9/14 = 0
1/21*x-9/14 = 0 // + 9/14
1/21*x = 9/14 // : 1/21
x = 9/14/1/21
x = 27/2
x = 27/2
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