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5t+25=9t+21
We move all terms to the left:
5t+25-(9t+21)=0
We get rid of parentheses
5t-9t-21+25=0
We add all the numbers together, and all the variables
-4t+4=0
We move all terms containing t to the left, all other terms to the right
-4t=-4
t=-4/-4
t=1
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