You want to isolate h on the left of the equation. To do this, you need to use laws of Algebra to move numbers from one side to the other.
The key thing to remember is that what you do on one side, must be done on the other side of the equation equally. i.e. if you subtract a number on one side, it must be subtracted on the other side.
-35 = 4h + 1
Start by moving the +1 to the other side by subtracting it, therefore cancelling it out on the side of the equation with h.
-35 - 1 = -36
The equation becomes:
-36 = 4h
Next divide 4 (since 4 is being multiplied with the h, you want to cancel it out on the side with the h, and move it across to the -36, to enable h to be isolated).
-36 divided by 4 = h
now divide -36 by 4 and you will get -9 (since a negative number divided by a positive number, causes a negative number to be produced).
h = -9
Its traditional to answer with the variable (h) on the left.
I hope this helps.