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18=42-4t
We move all terms to the left:
18-(42-4t)=0
We add all the numbers together, and all the variables
-(-4t+42)+18=0
We get rid of parentheses
4t-42+18=0
We add all the numbers together, and all the variables
4t-24=0
We move all terms containing t to the left, all other terms to the right
4t=24
t=24/4
t=6
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