Răspuns:
a) x×7=4×21
x×7=84
x=84:7
x=12
b) x×28=32×7
x×28=224
x=224:28
x=8
c) (x+1)×7=10×14
(x+1)×7=140
x+1=140:7
x+1=20
x=20-1
x=19
d) (2x+1)×3=15×27
(2x+1)×3=405
2x+1=405:3
2x+1=135
2x=135-1
2x=134
x=134:2
x=67
Sper ca te-am ajutat!
