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n in (-oo:+oo)
7*n-((2/5)*n)+3 = 0
7*n+(-2/5)*n+3 = 0
33/5*n+3 = 0 // - 3
33/5*n = -3 // : 33/5
n = -3/33/5
n = -5/11
n = -5/11
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