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20=-30+1.5t
We move all terms to the left:
20-(-30+1.5t)=0
We add all the numbers together, and all the variables
-(1.5t-30)+20=0
We get rid of parentheses
-1.5t+30+20=0
We add all the numbers together, and all the variables
-1.5t+50=0
We move all terms containing t to the left, all other terms to the right
-1.5t=-50
t=-50/-1.5
t=33+0.5/1.5
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