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2t-(-30)=12
We move all terms to the left:
2t-(-30)-(12)=0
determiningTheFunctionDomain 2t-12-(-30)=0
We add all the numbers together, and all the variables
2t+18=0
We move all terms containing t to the left, all other terms to the right
2t=-18
t=-18/2
t=-9
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