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12.75=0.15t
We move all terms to the left:
12.75-(0.15t)=0
We add all the numbers together, and all the variables
-(+0.15t)+12.75=0
We get rid of parentheses
-0.15t+12.75=0
We move all terms containing t to the left, all other terms to the right
-0.15t=-12.75
t=-12.75/-0.15
t=+85
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