September 2018 1 23 Report
Martín cometió algunos errores al resolver las ecuaciones marcalo y resolve correctamente.

a) 3x + 21 = 171
x + 21 = 171 : 3
x = 7 - 21
x = 36



b) 7x - 13 . 4 = 200
7x - 13 = 200 : 4
7x = 50 + 13
x = 63 : 7
x = 9
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