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-9=t-2.5
We move all terms to the left:
-9-(t-2.5)=0
We get rid of parentheses
-t+2.5-9=0
We add all the numbers together, and all the variables
-1t-6.5=0
We move all terms containing t to the left, all other terms to the right
-t=6.5
t=6.5/-1
t=-6+0.5/1
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