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15+3t=t+3
We move all terms to the left:
15+3t-(t+3)=0
We get rid of parentheses
3t-t-3+15=0
We add all the numbers together, and all the variables
2t+12=0
We move all terms containing t to the left, all other terms to the right
2t=-12
t=-12/2
t=-6
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