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n in (-oo:+oo)
4*n+2/5 = -178/5 // + -178/5
4*n+2/5-(-178/5) = 0
4*n+2/5+178/5 = 0
4*n+36 = 0 // - 36
4*n = -36 // : 4
n = -36/4
n = -9
n = -9
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