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6t-30=3t+21
We move all terms to the left:
6t-30-(3t+21)=0
We get rid of parentheses
6t-3t-21-30=0
We add all the numbers together, and all the variables
3t-51=0
We move all terms containing t to the left, all other terms to the right
3t=51
t=51/3
t=17
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