Equation #1:
[tex]6-x=2x+18 \\
-x-2x=18-6 \\
-3x=12 \\
x=\frac{12}{-3} \\
x=-4[/tex]
Equation #2:
[tex]5x-10=4x+3 \\
5x-4x=3+10 \\
x=13[/tex]
-4 is smaller than 13, so the solution to equation #1 is smaller than the solution to equation #2.
The answer is a.