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19.5=0.5t+15
We move all terms to the left:
19.5-(0.5t+15)=0
We get rid of parentheses
-0.5t-15+19.5=0
We add all the numbers together, and all the variables
-0.5t+4.5=0
We move all terms containing t to the left, all other terms to the right
-0.5t=-4.5
t=-4.5/-0.5
t=+9
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