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x in (-oo:+oo)
x/21 = 12/7 // - 12/7
x/21-(12/7) = 0
x/21-12/7 = 0
1/21*x-12/7 = 0 // + 12/7
1/21*x = 12/7 // : 1/21
x = 12/7/1/21
x = 36
x = 36
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