We know that HJ + JK = HK
So lets substitute each part for their equation.
(2x + 5) + (3x - 7) = 18
Combine like terms
5x -2 = 18
Add 2 to both sides to eliminate it
5x = 20
Divide both sides by 5
x = 4
Let me know if you have any questions about this! :)
