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

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



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

We move all terms to the left:

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

We get rid of parentheses

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

We add all the numbers together, and all the variables

8t-38=0

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

8t=38

t=38/8

t=4+3/4

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