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n in (-oo:+oo)
7 = (-2*n)/3 // - (-2*n)/3
7-((-2*n)/3) = 0
(2/3)*n+7 = 0
2/3*n+7 = 0 // - 7
2/3*n = -7 // : 2/3
n = -7/2/3
n = -21/2
n = -21/2
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