Oh! these are fun! ok so:
10x-3x=9-1
First, put the variables on one side,and the normal numbers on the other.
Keep in mind that u have to change the sign (+ or -) when you switch sides.
7x=8
Then group the numbers (10x-3x=7x)
Lastly, isolate the x, to get the answer:
x=8/7
Hope this helps!