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n in (-oo:+oo)
(15/4)*n+7 = 32 // - 32
(15/4)*n-32+7 = 0
15/4*n-25 = 0 // + 25
15/4*n = 25 // : 15/4
n = 25/15/4
n = 20/3
n = 20/3
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