Răspuns:
Explicație pas cu pas:
a) x + 7 = 3 <=> x = 3-7 => x = -4 ∈ Z
b) 6-x = 15 <=> 6-15 = x => x = -9 ∈ Z
c) 16-x = -4 <=> 16+4 = x => x = 20 ∈ Z
d) 11-x = 14 <=> 11-14 = x => x = -3 ∈ Z
a)-4+7 = 7-4 = 3
b) 6-(-9) = 6+9 = 15
c) 16-20 = -4
d) 11-(-3) = 11+3 = 14