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n in (-oo:+oo)
7*n+(3/2)*n = 30 // - 30
7*n+(3/2)*n-30 = 0
17/2*n-30 = 0 // + 30
17/2*n = 30 // : 17/2
n = 30/17/2
n = 60/17
n = 60/17
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