Respuesta:
[tex]\boxed{\mathrm{5x+\left\{-3y-\left[-x+\left(12y-x-y\right)\right]\right\}}}[/tex]
[tex]\mathrm{Recordar \ que:}[/tex]
[tex]\bold{a+\left(b+c\right)=a+b+c}[/tex]
[tex]5x+\left\{-3y-\left[-x+\left(12y-x-y\right)\right]\right\}=5x-3y-\left(-x+\left(12y-x-y\right)\right)[/tex]
[tex]-\left(-x+\left(12y-x-y\right)\right)=2x-11y[/tex]
[tex]5x-3y+2x-11y[/tex]
[tex]\mathrm{Agrupamos \ terminos:}[/tex]
[tex]5x+2x-3y-11y[/tex]
[tex]5x+2x=7x[/tex]
[tex]-3y-11y=-14y[/tex]
Solución:
[tex]\boxed{\mathrm{7x-14y}}[/tex]
Saludos...
