Question

Daca x=7 si xy + xz=140 , atunci aflati suma y+z .

Answer 1

xy+xz=140=x(y+z), x=7, 
140=7(y+z)
20=y+z

Answer 2

poi xy + xz=140
x iese factor comun
x(y+z)=140
x este 7
7(y+z)=140/÷7
y+z=20