3(t-1)=3(t+7)

Solution for 3(t-1)=3(t+7) equation:

3(t-1)=3(t+7)

We simplify the equation to the form, which is simple to understand 
3(t-1)=3(t+7)

Reorder the terms in parentheses
+(+3t-3)=3*(t+7)

Remove unnecessary parentheses
+3t-3=+3+*(+t+7+)

Reorder the terms in parentheses
+3t-3=+(+3t+21)

Remove unnecessary parentheses
+3t-3=+3t+21

We move all terms containing t to the left and all other terms to the right. 
+3t-3t=+21+3

We simplify left and right side of the equation. 
t=+24

0=24

The left and right sides are not equal, therefore there is no solution. This equation is invalid.