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0=21.8+10.9t
We move all terms to the left:
0-(21.8+10.9t)=0
We add all the numbers together, and all the variables
-(10.9t+21.8)+0=0
We add all the numbers together, and all the variables
-(10.9t+21.8)=0
We get rid of parentheses
-10.9t-21.8=0
We move all terms containing t to the left, all other terms to the right
-10.9t=21.8
t=21.8/-10.9
t=-2
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