Question 319015
{{{5(3- 3t) = 30}}} distribute
{{{15 - 15t = 30}}} subtract 15 from both sides
{{{-15t = 15}}} divide both sides by -15
{{{t = -1}}}
check your answer
Does 
{{{5(3 - 3(-1)) = 30}}}
{{{5(3+3) = 30}}}
{{{5*6 = 30}}} which is true so t = -1 is the correct solution