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x in (-oo:+oo)
x/7+65+72+75+80+96 = 80 // - 80
x/7-80+65+72+75+80+96 = 0
1/7*x+308 = 0 // - 308
1/7*x = -308 // : 1/7
x = -308/1/7
x = -2156
x = -2156
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