looking at it I can tell you w = 0. The work for this is:
(7w/8)*8=(4w/8+6w/8)*8
7w=4w+6w
7w=10w
0=3w
w=0/3 or 0
Final answer:
w=0
For future reference, if an equation has only one variable and no constants, one solution will always be 0.
Hope I helped :)