[tex]\boldsymbol{\sf{x-19=40}}[/tex]
Suma 19 a ambos lados
[tex]\boldsymbol{\sf{x-19+19=40+19}}[/tex]
En x-19+19, se aplica las leyes de signo donde
- x + = -
[tex]\boldsymbol{\sf{x=40+19 \ \ \to \ \ \ Sumar}}[/tex]
[tex]\red{\boxed{\boldsymbol{\red{\sf{x=59 }}} }} \ \ \boldsymbol{\sf{\red{\Rightarrow}}} \ \ \boldsymbol{\sf{\red{Respuesta}}}[/tex]
↓
[tex]\bf{\underline{Comprobaci\acute{o}n}}[/tex]
[tex]\boldsymbol{\sf{x-19=40}}[/tex]
[tex]\boldsymbol{\sf{50-19=40 \ \ \to \ \ \ Restar}}[/tex]
[tex]\boldsymbol{\sf{40=40}}[/tex]
[tex]\pmb{Se \ cumple \ la \ igualdad.}[/tex]
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