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18t+9=(+)
We move all terms to the left:
18t+9-((+))=0
We add all the numbers together, and all the variables
18t+9-(0)=0
We add all the numbers together, and all the variables
18t+9=0
We move all terms containing t to the left, all other terms to the right
18t=-9
t=-9/18
t=-1/2
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