Express the set -4x+21=3x+14 using interval notation.

Question

Please help

Answer 1

-4x + 21 = 3x + 14          add 4x to both sides

21 = 7x + 14                    subtract 14 from both sides

-7 = 7x                             divide both sides by 7

-1 = x

 

This type of solution would be notated: x ∈ {-1}.