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x = 8 : 64
x = 0,125 o 1/8
63x=9
x = 9 : 63
x = 0,1428 o 1/7
44/88+ 24/72 + 20/80 +x = 8/16 -5/20
primero voy a simplificar las fracciones
44/88 = 11/22= 1/2
24/72 = 3/9 = 1/3
20/80= 2/8 =1/4
8/16 = 1/2
- 5/20= - 1/4
1/2 + 1/3 + 1/4 + x = 1/2 - 1/4
x = - 1/4 - 1/3 - 1/4
x = -5/6
saludos