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15=30-(3t)
We move all terms to the left:
15-(30-(3t))=0
We add all the numbers together, and all the variables
-(-3t+30)+15=0
We get rid of parentheses
3t-30+15=0
We add all the numbers together, and all the variables
3t-15=0
We move all terms containing t to the left, all other terms to the right
3t=15
t=15/3
t=5
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