Mathematic Problems
22log104x-1-7log104x=7log104x-1-3×4log104x
F: 4x>0  x>0
t=log104x
22t-1-7t=7t-1-3×4t
22t×2-1-7t=7t×7-1-3×4t
4t×12-7t=7t×17-3×4t
4t2-7t=7t7-3×4t /÷4t
12-7t4t=7t7×4t-3
12-74t=17×74t-3
-74t-17×74t=-3-12
-87×74t=-72/ ×-78
74t=4916
74t=742
t=2
log104x=tlog104x=2
log104x=log10102
4x=100
x=25
x=25