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-t/15=7
We move all terms to the left:
-t/15-(7)=0
We multiply all the terms by the denominator
-t-7*15=0
We add all the numbers together, and all the variables
-1t-105=0
We move all terms containing t to the left, all other terms to the right
-t=105
t=105/-1
t=-105
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