I believe it’s 90 I’m not sure but
I think it’s x+1x^3... not sure if this helps
12x15=18(3x+4)
180=54x+72
-72 -72
108=54x
/54 /54
2=x
X=2 the other person is a d0uche for answering like that so I answered instead of them
-3.
Coefficients are numbers that have a variable next to it, thus leading it to be -e of the -3x.
Hope this helps!
Take a picture of your work and send it so I can help you
