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4t-(-9)=13
We move all terms to the left:
4t-(-9)-(13)=0
determiningTheFunctionDomain 4t-13-(-9)=0
We add all the numbers together, and all the variables
4t-4=0
We move all terms containing t to the left, all other terms to the right
4t=4
t=4/4
t=1
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