aa*bb=ccdd
9(2z+5)=4(6z-1)
x-21x+20=0
1497840
24545832
19495292
3507344
4486630
3683059
9437049
8840510
(26-x)+x+(25-x)+3
a = mx / q - 3x
y= 8/3x + 3
5903863
9503863
2+90%4*4-8
