Indicate which property has been illustrated in Step 7.answer choices A. distributive B. associative C. commutative D. arithmetic fact

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