first distribute the 5 and the 3 because the parenthesis mean to multiply

5x3= 13

Then u have to distribute the 5 and the -3t because u must multiply everything in the parenthisis

5x-3t= -15t

Now your equation is

15-15t=30

you have to get the t by itself so u can solve for t. In order to

do that u have to subtract 15 from both sides.

15-15=0 30-15=15

now your equation is -15t=15

After this you have to divde both sides by -15 because you want to isolate the value

-15

------=1t also known as t and

-15

15

---------= -1

-15

There fore t=-1

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To Check just plug the value back in for t.

5(3-3t)=30

15-15t=30

15-15(-1)=30

15+15=30

30=30

U just have to plug in -1 into t after u have distributed the properties