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k in (-oo:+oo)
(2/3)*k = 28*49 // - 28*49
(2/3)*k-(28*49) = 0
(2/3)*k-1372 = 0
2/3*k-1372 = 0 // + 1372
2/3*k = 1372 // : 2/3
k = 1372/2/3
k = 2058
k = 2058
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