-6x -(3x)
Pretend that there is a -1 in front of the bracket
-6x-1(3x)
mutiply the bracket by -1
(-1)(3x)= -3x
-6x-3x= -9x
-9x
Step-by-step explanation:
You subtract 3 from -6. When you subtract on a negative number you go backwards.
a is the right answer