Answer:
36b - 45 - 18b = 9 ( 18b - 45 )
Step-by-step explanation:
36b - 45 - 18b = 9 ( _b - _ )
first combine like terms:
36b - 45 - 18b
18b - 45
then just substitute the combined numbers into the brackets
9 ( _b - _ )
9 (18b - 45)
9(2b-6)
36b-45-18b=9
36b-18b-45-9=0
18b-54
9(2b-6) (Take 9 common from both)
