Răspuns :
a) 2a-3=17
2a=20
a=10
b) 120:z=12
z=120:12
z=10
c) 8y+6=42-4
8y=38-6
8y=32
y=4
d) 20+3t=100:2
20+3t=50
3t=50-20
3t=30
t=10
2a=20
a=10
b) 120:z=12
z=120:12
z=10
c) 8y+6=42-4
8y=38-6
8y=32
y=4
d) 20+3t=100:2
20+3t=50
3t=50-20
3t=30
t=10