Answer:
The third side is 17m-4
Step-by-step explanation:
The perimeter of a triangle is the sum of the three sides. Call the third side x
x + 5m-7 + 2m+5 = 24m -6
Combine like terms
x +7m-2 = 24m -6
Solve for x
Subtract 7m from each side
x +7m-7m -2 = 24m-7m -6
x -2 = 17m-6
Add 2 to each side
x-2+2 = 17m-6+2
x = 17m-4
The third side is 17m-4
