We have to write an equation whose solution is x = 3.5, and it must require at least three steps to be solved.
The equation would be
[tex]x+x+7=14[/tex]To solve this equation, first, we sum like terms
[tex]2x+7=14[/tex]Second, we subtract 7 on each side
[tex]\begin{gathered} 2x+7-7=14-7 \\ 2x=7 \end{gathered}[/tex]Third, we divide the equation by 2
[tex]\begin{gathered} \frac{2x}{2}=\frac{7}{2} \\ x=3.5 \end{gathered}[/tex]