How to solve for capitalized letter

3x=8g+8W

W = (3 x)/8-g

Rearrange your equation to get the w on the left

3x=8g+8W
- 8W = 8g - 3x
divide both sides by -8
W = (8/-8)g - (3/-8)x
W = -g + (3/8)x

Conventionally, terms with letters come first so:
W = (3/8)x - g

3x = 8g + 8W
8W = 3x - 8g
W = (3x - 8g)/8 or (3x/8) - g . . . . . but NOT 3x/(8-g)

Mαthmφm

3x=8g+8W
-8g -8g
3x-8g=8W
divide both sides by 8.
3/8x-g=W