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13-20t=-7-12t-20
We move all terms to the left:
13-20t-(-7-12t-20)=0
We add all the numbers together, and all the variables
-20t-(-12t-27)+13=0
We get rid of parentheses
-20t+12t+27+13=0
We add all the numbers together, and all the variables
-8t+40=0
We move all terms containing t to the left, all other terms to the right
-8t=-40
t=-40/-8
t=+5
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