(21)16*3.2-44.6=3x
3x=6.6
x=2.2
(22)5x-0.5=8
5x=8.5
x=1.7
(23)(x-4.6)*2.3=9.338
x-4.6=4.06
x=8.66
(24)3x-1.45=2x+1.45
x=1.45+1.45
x=2.9