Respuesta :

[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]

Let's solve for x ~

[tex]\qquad \tt  \dashrightarrow \: 4(3 + x) + x = x + 4[/tex]

[tex]\qquad \tt  \dashrightarrow \: 12 + 4x+ x = x + 4[/tex]

[tex]\qquad \tt  \dashrightarrow \: 5x + 12 = x + 4[/tex]

[tex]\qquad \tt  \dashrightarrow \: 5x - x = 4 - 12[/tex]

[tex]\qquad \tt  \dashrightarrow \: 4x = - 8[/tex]

[tex]\qquad \tt  \dashrightarrow \: x = - 8 \div 4[/tex]

[tex]\qquad   \dashrightarrow \: \boxed{ \tt x = - 2 }[/tex]

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