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n in (-oo:+oo)
(4/3)*n = 21/3 // - 21/3
(4/3)*n-(21/3) = 0
(4/3)*n-7 = 0
4/3*n-7 = 0 // + 7
4/3*n = 7 // : 4/3
n = 7/4/3
n = 21/4
n = 21/4
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