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180=30t+20
We move all terms to the left:
180-(30t+20)=0
We get rid of parentheses
-30t-20+180=0
We add all the numbers together, and all the variables
-30t+160=0
We move all terms containing t to the left, all other terms to the right
-30t=-160
t=-160/-30
t=5+1/3
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