Explicación paso a paso:
[tex]7x + 2x - 45 = 90[/tex]
[tex]9x - 45 = 90[/tex]
[tex]9x = 90 + 45[/tex]
[tex]9x = 135[/tex]
[tex]x = 135 \div 9[/tex]
[tex]x = 15[/tex]
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Explicación paso a paso:
hola ✓
[tex]7x + 2x - 45 = 90[/tex]
[tex]9x - 45 = 90[/tex]
[tex]9x = 90 + 45[/tex]
[tex]9x = 135[/tex]
[tex]x = 135 \div 9[/tex]
[tex]x = 15[/tex]
espero te sirva saludos