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k in (-oo:+oo)
k/3+8.3 = 29.3 // - 29.3
k/3-29.3+8.3 = 0
1/3*k-21 = 0 // + 21
1/3*k = 21 // : 1/3
k = 21/1/3
k = 63
k = 63
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