13-21t=3(4-2t)

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Solution for 13-21t=3(4-2t) equation: 



13-21t=3(4-2t)

We move all terms to the left:

13-21t-(3(4-2t))=0

We add all the numbers together, and all the variables

-21t-(3(-2t+4))+13=0



We calculate terms in parentheses: -(3(-2t+4)), so:

3(-2t+4)

We multiply parentheses

-6t+12

Back to the equation:

-(-6t+12)



We get rid of parentheses

-21t+6t-12+13=0

We add all the numbers together, and all the variables

-15t+1=0

We move all terms containing t to the left, all other terms to the right

-15t=-1

t=-1/-15

t=1/15

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