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12=8-4t
We move all terms to the left:
12-(8-4t)=0
We add all the numbers together, and all the variables
-(-4t+8)+12=0
We get rid of parentheses
4t-8+12=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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