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-20t-9+15t=-4t+1
We move all terms to the left:
-20t-9+15t-(-4t+1)=0
We add all the numbers together, and all the variables
-5t-(-4t+1)-9=0
We get rid of parentheses
-5t+4t-1-9=0
We add all the numbers together, and all the variables
-1t-10=0
We move all terms containing t to the left, all other terms to the right
-t=10
t=10/-1
t=-10
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