(7t-21)=(t+4)=15

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Solution for (7t-21)=(t+4)=15 equation: 



(7t-21)=(t+4)=15

We move all terms to the left:

(7t-21)-((t+4))=0

We get rid of parentheses

7t-((t+4))-21=0



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

(t+4)

We get rid of parentheses

t+4

Back to the equation:

-(t+4)



We get rid of parentheses

7t-t-4-21=0

We add all the numbers together, and all the variables

6t-25=0

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

6t=25

t=25/6

t=4+1/6

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