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n in (-oo:+oo)
(2/3)*n+4 = -25 // + 25
(2/3)*n+4+25 = 0
2/3*n+29 = 0 // - 29
2/3*n = -29 // : 2/3
n = -29/2/3
n = -87/2
n = -87/2
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