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0.21=t+0.9
We move all terms to the left:
0.21-(t+0.9)=0
We get rid of parentheses
-t-0.9+0.21=0
We add all the numbers together, and all the variables
-1t-0.69=0
We move all terms containing t to the left, all other terms to the right
-t=0.69
t=0.69/-1
t=-0.69/1
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