what is 9[2x - 9.5 = -16.5 + 8x

Question

 i need to know this for a question 

Answer 1

You typed one left square bracket but no right square bracket to match that.

 

ASSUMING that the missing ] should be inserted after 9.5, then this is simply a distribution problem.

 

Multiply the contained-in-brackets quantities by 9, then collect 'like' terms and solve in the usual manner.