Parallel to 4x + 5y = 12, and passes through (5, 3)
New equation will have the same LEFT-SIDE. Now use the left side to substitute point into, to get right-side.
In other words, we get: 4x + 5y = 4(5) + 5(3)
4x + 5y = 20 + 15
<======= YOUR equation
That's ALL. NOTHING more, NOTHING less!!