[tex]4.3t+6.8=8.4t-7.55[/tex]
we place the t's on the same side and the other nombers on the other side
[tex]6.8+7.55=8.4t-4.3t[/tex]
now do the operations
[tex]14.35=4.1t[/tex]
then solve t
[tex]\begin{gathered} t=\frac{14.35}{4.1} \\ \\ t=3.5 \end{gathered}[/tex]
the value of t is 3.5 so the rigth option is D
