Question

3t-7=5t, then what does 6t=

Answer 1

$3t-7=5t \ \ \ \ \ \ \ \ \ |-3t \\ -7=2t \ \ \ \ \ \ \ \ \ \ \ \ |\times 3 \\ -21=6t \\ \\ \boxed{6t=-21}$

Answer 2

Subtract 3t from the equation to get 2t=-7.  Multiply by three to find that 6t=-21.