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78+7t=111+4t
We move all terms to the left:
78+7t-(111+4t)=0
We add all the numbers together, and all the variables
7t-(4t+111)+78=0
We get rid of parentheses
7t-4t-111+78=0
We add all the numbers together, and all the variables
3t-33=0
We move all terms containing t to the left, all other terms to the right
3t=33
t=33/3
t=11
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