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n in (-oo:+oo)
(3/4)*n+7 = 121/16 // - 121/16
(3/4)*n-(121/16)+7 = 0
(3/4)*n-121/16+7 = 0
3/4*n-9/16 = 0 // + 9/16
3/4*n = 9/16 // : 3/4
n = 9/16/3/4
n = 3/4
n = 3/4
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