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-20=6t-4t
We move all terms to the left:
-20-(6t-4t)=0
We add all the numbers together, and all the variables
-(+2t)-20=0
We get rid of parentheses
-2t-20=0
We move all terms containing t to the left, all other terms to the right
-2t=20
t=20/-2
t=-10
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