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21/3=t/12
We move all terms to the left:
21/3-(t/12)=0
We add all the numbers together, and all the variables
-(+t/12)+21/3=0
We add all the numbers together, and all the variables
-(+t/12)+7=0
We get rid of parentheses
-t/12+7=0
We multiply all the terms by the denominator
-t+7*12=0
We add all the numbers together, and all the variables
-1t+84=0
We move all terms containing t to the left, all other terms to the right
-t=-84
t=-84/-1
t=+84
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