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x in (-oo:+oo)
x/21 = 21.2 // - 21.2
x/21-21.2 = 0
1/21*x-21.2 = 0 // + 21.2
1/21*x = 21.2 // : 1/21
x = 21.2/1/21
x = 445.19997774
x = 445.19997774
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