Răspuns:
5x=40 => x=40:5 => x=8
5 + x = 4 0 => x=40-5 => x=35
x x 4 = 24 => x=24:4 => x=6
x + 4 = 2 4 => x=24-4 => x=20
Explicație pas cu pas:
5×x=40 |÷5
x=8
5+x=40 |-5
x=35
x×4=24 |÷4
x=6
x+4=24 |-4
x=20
