Answer:
-16m + 16n + 77
Step-by-step explanation:
2(m - n) - 18(m - n) + 77
We can let x = (m - n) to make our job easier.
2x - 18x + 77
Now, we can conclude that this expression is equal to -16x + 77.
We can substitute x = (m - n) back into the expression:
-16(m - n) + 77
Distribute:
-16m + 16n + 77
And you're done!
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