Chong Jia Tao's answer to Amirah's Secondary 1 Maths Singapore question.

done {{ upvoteCount }} Upvotes
clear {{ downvoteCount * -1 }} Downvotes
Chong Jia Tao
Chong Jia Tao's answer
8 answers (A Helpful Person)
9=6x+15
6x=9-15=-6
x=-1