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n in (-oo:+oo)
28*(5/4) = (5*(4/5)*n)/4 // - (5*(4/5)*n)/4
28*(5/4)-((5*(4/5)*n)/4) = 0
28*(5/4)-n = 0
35-n = 0 // - 35
-n = -35 // * -1
n = 35
n = 35
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