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-15-20-12t=-9t+19
We move all terms to the left:
-15-20-12t-(-9t+19)=0
We add all the numbers together, and all the variables
-12t-(-9t+19)-35=0
We get rid of parentheses
-12t+9t-19-35=0
We add all the numbers together, and all the variables
-3t-54=0
We move all terms containing t to the left, all other terms to the right
-3t=54
t=54/-3
t=-18
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