5/6h - 7/12 = 3/4h - 13/6

5/6h-7/12=3/4h-13/6

5/6h+-7/12=3/4h+-13/6

Subtract 3/4h from both sides.

5/6h+-7/12-3/4h=3/4h+-13/6-3/4h

1/12h+-7/12=-13/6

Add 7/12 to both sides.

1/12h+-7/12+7/12=-13/6+7/12

1/12h=-19/12

Multiply both sides by 12.

12 * (1/12h) = 12 * (-19/12)

h=-19