Respuesta:
7x-10=300
7x -10+10=310
6x+20=40
6x+20-20=40-20
=29 ×
.
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Respuesta:
7x-10=300
7x-10=300
7x -10+10=310
6x+20=40
6x+20-20=40-20
=29 ×
.