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t + t - 3 = 4

 

combine like terms

 

2t - 3 = 4

  

Get t alone

 

2t - 3 = 4

    +3   +3

2t = 7

 

divide both sides by 2

 

2t/2 = 7/2

 

your answer is:

 

t= 7/2 (3.5)