We have the following:
[tex]0.2\mleft(d-6\mright)=5+0.4d-3[/tex]solving for d
[tex]\begin{gathered} 0.2\cdot d-0.2\cdot6=2+0.4d \\ 0.2d-0.4d-1.2=2 \\ -0.2d=2+1.2 \\ d=\frac{3.2}{0.2} \\ d=-16 \end{gathered}[/tex]Therefore the solution of the equation is -16
