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0=2100-18t
We move all terms to the left:
0-(2100-18t)=0
We add all the numbers together, and all the variables
-(-18t+2100)+0=0
We add all the numbers together, and all the variables
-(-18t+2100)=0
We get rid of parentheses
18t-2100=0
We move all terms containing t to the left, all other terms to the right
18t=2100
t=2100/18
t=116+2/3
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