5(t - 9) + 12 
So then you need to use the distributive property, multiply 5 to t and 5 to -9. 
Like this:
5t - 45 + 12 
Then combining like terms, -45 and 12 are like terms because don’t have any letter. 
5t - 33 
So this it’s the answer I think that it’s correct. Hope this can help you.