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6.9t=8.1t+25.9
We move all terms to the left:
6.9t-(8.1t+25.9)=0
We get rid of parentheses
6.9t-8.1t-25.9=0
We add all the numbers together, and all the variables
-1.2t-25.9=0
We move all terms containing t to the left, all other terms to the right
-1.2t=25.9
t=25.9/-1.2
t=-21+0.7/1.2
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