T(n)=20-3n

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Solution for T(n)=20-3n equation: 



(T)=20-3T

We move all terms to the left:

(T)-(20-3T)=0

We add all the numbers together, and all the variables

T-(-3T+20)=0

We get rid of parentheses

T+3T-20=0

We add all the numbers together, and all the variables

4T-20=0

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

4T=20

T=20/4

T=5

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