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2t+20=-2t
We move all terms to the left:
2t+20-(-2t)=0
We get rid of parentheses
2t+2t+20=0
We add all the numbers together, and all the variables
4t+20=0
We move all terms containing t to the left, all other terms to the right
4t=-20
t=-20/4
t=-5
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