Răspuns:
a) 5x-9=16
5x=9+16
5x=22
x=22:5
x=4,4
b)7x=21
x=21:7
x=3
C)9+x=1
x=9-1
x=8
d)x-3=1-2
x=3+1-2
x=4-2
x=2