subtract the numbers:
9x-6=7+8x-4
9x-6=3+8x
rearrange terms :
9x-6=3+8x
9x-6=3+8x
add both sides to 6:
9x-6=8x+3
9x-6=8x+3
+6. +6
simplify: add the numbers
9x=8x+9
subtract 8x from both sides
9x=8x+9
9x=8x+9
-8. -8
simplify: Combine like terms,
Multiply by 1
x=9
hope that helped