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-4(t-12)=20
We move all terms to the left:
-4(t-12)-(20)=0
We multiply parentheses
-4t+48-20=0
We add all the numbers together, and all the variables
-4t+28=0
We move all terms containing t to the left, all other terms to the right
-4t=-28
t=-28/-4
t=+7
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