Answer:
6x+9x+4-11=21x-7
15x-7=21x-7
15x-21x=0
x=0
GCF= 1
LCM= 1680
Step-by-step explanation:
GCF= Find the prime factorization of 21, 21 = 3 x 7
Find the prime factorization of 80, 80 = 2 x 2 x 2 x 2 x 5
Then multiply the prime factors both numbers have in common
LCM= multiply the two numbers together and ignore all negative signs
distribute
collect like-terms
Attached file
