November 2018 2 79 Report
1. Encuentra un número que al sustituir la letra se verifique la igualdad:
a) x + 2 = 6 b) a – 2 = 8 c) 5 + x = 7 d) 4 + x = 10 – 2
2. Resuelve las siguientes ecuaciones.
a)2x + 8 = x + 25 + 8
b) 3x + 23 = 2x + 59
c) x + 12 = 17
d) 2x – 4 = x + 9
e) 5x – 10 = 4x – 12

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