Answer:
First result: X = 248/3 or 82.67 Second result: X = 260/3 or 86.57
Explanation:
1st one: 7x + 8(x + 1/4) = 3(6x - 90 - 8)
 7x + 8x + 2 = 18x - 270 - 24
 15x + 2 - 2 = 18x - 246 - 2
 15x - 18x = 18x - 18x -248
 -3x = 248 --> -3x/3 = 248/3
 X = 248/3 or X = 82.67
2nd one: 7x + 8(x+1/4) = 3(6x - 90) - 8
 7x + 8x + 2 = 18x - 270 - 8
 15x + 2 - 2 = 18x - 262 - 2 
 15x - 18x = 18x -18x - 260
 -3x = 260 --> -3x/3 = 260/3
  X = 260/3 or X = 86.67
Sorry if none of these are the answer!