Question

How do I solve this equation? If 3t-7=5t then 6t=a 21b-7c-21d-42

Answer 1

$3t-7=5t \ \ \ \ \ |\hbox{subtract 3t} \\ -7=2t \ \ \ \ \ \ \ \ |\hbox{multiply by 3} \\ -21=6t \\ \\ \boxed{6t=-21} \\ \hbox{answer C}$