Respuesta:
[tex]x = 15[/tex]
Explicación paso a paso:
[tex]3x - 15 + 60 = 90 \\ 3x + 45 = 90 \\ 3x = 90 - 45 \\ 3x = 45 \\ x = 15[/tex]
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Respuesta:
[tex]x = 15[/tex]
Explicación paso a paso:
[tex]3x - 15 + 60 = 90 \\ 3x + 45 = 90 \\ 3x = 90 - 45 \\ 3x = 45 \\ x = 15[/tex]