Respuesta :

From the problem, in Step 7 :

[tex]\begin{gathered} \text{ Step 6 :} \\ -12x+(-x+36)-1=0 \\ \text{ Step 7 :} \\ (-12x-x)+36-1=0 \end{gathered}[/tex]

This property is called associative which states that the grouping of numbers does not change the sum.

ANSWER :

B. Associative

RELAXING NOICE
Relax