I'm pretty sure the answer's one, but I need an expression. I will give brainiest to whoever answers this!!!

Answer:
0x+1 (or just 1)
Step-by-step explanation:
if non shaded/ white tiles are negative, and shaded positive expression would look like:
2x+4 and -2x-3
when simplified 2x-2x cancels out, and 4-3=1.
what is left over is just 1.