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0.21=t/873.36-2.15
We move all terms to the left:
0.21-(t/873.36-2.15)=0
We get rid of parentheses
-t/873.36+2.15+0.21=0
We multiply all the terms by the denominator
-t+(2.15)*873.36+(0.21)*873.36=0
We add all the numbers together, and all the variables
-1t+2061.1296=0
We move all terms containing t to the left, all other terms to the right
-t=-2061.1296
t=-2061.1296/-1
t=2061+0.12960000000021/1
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