Respuesta:
[tex]3x + 3x = 90 \\ 6x = 90 \\ x = 90 \div 6 \\ x = 15[/tex]
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Respuesta:
[tex]3x + 3x = 90 \\ 6x = 90 \\ x = 90 \div 6 \\ x = 15[/tex]