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30=2t-10
We move all terms to the left:
30-(2t-10)=0
We get rid of parentheses
-2t+10+30=0
We add all the numbers together, and all the variables
-2t+40=0
We move all terms containing t to the left, all other terms to the right
-2t=-40
t=-40/-2
t=+20
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