Răspuns:
Explicație pas cu pas:
a)
1 + 6 x = 13
6 x = 13 - 1
6 x = 12
x = 12 : 6
x = 2 ∈ Z
verific: 1 + 6 x = 1 + 6 × 2 = 1 + 12 = 13
_____________________________
b)
10 x = 70
x = 70 : 10
x = 7
Verific: 10 x = 10 × 7 = 70
____________________
c)
x : ( - 8 ) = 10
x = 10 × ( - 8)
x = - 80 ∈ Z
Verific:
x : ( - 8 ) = ( - 80 ) : ( - 8) = 10
