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0=12t-30
We move all terms to the left:
0-(12t-30)=0
We add all the numbers together, and all the variables
-(12t-30)=0
We get rid of parentheses
-12t+30=0
We move all terms containing t to the left, all other terms to the right
-12t=-30
t=-30/-12
t=2+1/2
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