Question

determinati numarul natural x,pentru care
3x+19 supra 5=x+3

Answer 1

3x+19=5(x+3)
3x+19=5x+15
3x-5x=15-19
-2x=-4
x=2 ∈ N
S={2}

Answer 2

$\frac{3x+19}{5}$=x+3
3x+19=5x+15
-2x=-4
x=2