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x 9
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7920
7920-40 igual aa 7880
Si perdiera 40 = x -40
Planteando la ecuación:
x +880 = 9 ( x -40)
x +880 = 9x -360
880 +360 = 9x -x
1240 = 8x
1240/8 = x
155 = x
x = 155
Tengo s/. 155