[tex]\Box \ \ \boxed{\begin{array}{l}\sf x+x+500+100=x+250+500 \end{array}}\\\Box \ \ \boxed{\begin{array}{l}\sf 2x-x=750-600 \end{array}}\\\Box \ \ \boxed{\begin{array}{l}\sf x=150 \ \checkmark \end{array}}[/tex]
[tex]\boxed{\begin{array}{l}\sf a)\\-3x600=750\\\\b)\\\huge\boxed{\sf -x+400=250 \ \huge\boxed{\sf \checkmark}}\\\\c)\\-x=1350\\\\d)-2x+600=x750\end{array}}[/tex]
b)
-x + 400 = 250
-150 + 400 = 250
400 - 150 = 250
Resposta correta;
b)
-x + 400 = 250
[tex]|\underline{\overline{\mathcal{\boldsymbol{\LaTeX}}}}|[/tex]
