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13=20-1.5t
We move all terms to the left:
13-(20-1.5t)=0
We add all the numbers together, and all the variables
-(-1.5t+20)+13=0
We get rid of parentheses
1.5t-20+13=0
We add all the numbers together, and all the variables
1.5t-7=0
We move all terms containing t to the left, all other terms to the right
1.5t=7
t=7/1.5
t=4+1/1.5
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