Question

xy+xz=126; x=5; y+z=?

Answer 1

xy+xz=126
x(y+z)=126
5(y+z)=126
y+z=126/5=25.2

Answer 2

$xy+xz=126 \\ x=5 \\ y+z=? \\ xy+xz=126 \\ x(y+z)=126 \\ 5(y+z)=126 \\ y+z=126:5 \\ y+z=25,2$