25 exponent 2(9x-1) over 10 =5
2*10^3÷3
7x congruence 8 mod 11 solve
frc{Bo}{Bo}$ O\srt\Bx} $$$$
2y-x=-3
x+2y=7
(399+143/2)/400%
$\sqrt{\Box}$
...
3 $\sqrt{\Box}$ 346 - $\sqrt{\Box}$ 25
