Question 156722
You're on the right track. Once you have the solution {{{x=3}}}, simply graph {{{x=3}}} by drawing a vertical line through {{{x=3}}} like this



{{{ drawing(500, 500, -10, 10, -10, 10,
graph( 500, 500, -10, 10, -10, 10, 0),
line(3,-20,3,20)
) }}} Graph of {{{x=3}}}