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n in (-oo:+oo)
n/10-2.5 = 7 // - 7
n/10-7-2.5 = 0
1/10*n-9.5 = 0 // + 9.5
1/10*n = 9.5 // : 1/10
n = 9.5/1/10
n = 95
n = 95
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