Question

m - 1 = 9m + 15

Answer 1

m - 1 = 9m + 15
m=9m+16
-8m=16
m=16/-8
m=-2

Answer 2

@jdjrferg4 please do not just give the answer.
I assume you want to solve for \(m\)?
Here is an \(example\):
\(m - 3 = 9m + 20\)
Get m on one side:
\(m - 9m = 3 + 20\)
Combine like terms:
\(-8m = 23\)
Divide each side by \(-8\):
\(\dfrac{-8m}{-8} = \dfrac{23}{-8}\)
\(\dfrac{\cancel{-8}m}{\cancel{-8}} = \dfrac{23}{-8}\)
\(m = \dfrac{-23}{8}\)