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15% x - 20 = 100
15x/100 - 20 = 100
3x/20 - 20 = 100
(3x - 400)/20 = 100
(3x - 400) = 100.20
3x - 400 = 2000
3x = 2000 + 400
3x = 2400
x = 2400/3
x = 800
El número es 800.
15%100
? 20
15
20
_
00
00
15
_
1000= El Menos Es -5
Espero Te Sirva