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30-2t=30-4t
We move all terms to the left:
30-2t-(30-4t)=0
We add all the numbers together, and all the variables
-2t-(-4t+30)+30=0
We get rid of parentheses
-2t+4t-30+30=0
We add all the numbers together, and all the variables
2t=0
t=0/2
t=0
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