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n in (-oo:+oo)
n/4+80+85+95 = 90 // - 90
n/4-90+80+85+95 = 0
1/4*n+170 = 0 // - 170
1/4*n = -170 // : 1/4
n = -170/1/4
n = -680
n = -680
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