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-2(2t+10)=-12

We move all terms to the left:

-2(2t+10)-(-12)=0

We add all the numbers together, and all the variables

-2(2t+10)+12=0

We multiply parentheses

-4t-20+12=0

We add all the numbers together, and all the variables

-4t-8=0

We move all terms containing t to the left, all other terms to the right

-4t=8

t=8/-4

t=-2

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