Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

Solve for x=0. $3(2+x)=3(2+0)=3(2)=6$ $6+x=6+0=6$ Solve for x=1. $3(2+x)=3(2+1)=3(3)=9$ $6+x=6+1=7$ Just because two expressions have the same result for one input does not guarantee they will give the same result for all inputs. To be equivalent the expressions must have the same result for any input value.