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-3(2t+1)=-39
We move all terms to the left:
-3(2t+1)-(-39)=0
We add all the numbers together, and all the variables
-3(2t+1)+39=0
We multiply parentheses
-6t-3+39=0
We add all the numbers together, and all the variables
-6t+36=0
We move all terms containing t to the left, all other terms to the right
-6t=-36
t=-36/-6
t=+6
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