To solve the system of equations:
٤٠ - ٣ت = ١٠
٣ت - س = ٣٥
We can solve the first equation for t:
٣ت = ٤٠ - ١٠
٣ت = ٣٠
ت = ١٠
Now we substitute t = ١٠ into the second equation:
٣(١٠) - س = ٣٥
٣٠ - س = ٣٥
-س = ٥
س = -٥
Therefore, the solution to the system of equations is t = ١٠ and s = -٥.