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45+2.5(1-t)=0
We add all the numbers together, and all the variables
2.5(-1t+1)+45=0
We multiply parentheses
-2.5t+2.5+45=0
We add all the numbers together, and all the variables
-2.5t+47.5=0
We move all terms containing t to the left, all other terms to the right
-2.5t=-47.5
t=-47.5/-2.5
t=+19
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