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3=5+11.5-t
We move all terms to the left:
3-(5+11.5-t)=0
We add all the numbers together, and all the variables
-(-1t+16.5)+3=0
We get rid of parentheses
1t-16.5+3=0
We add all the numbers together, and all the variables
t-13.5=0
We move all terms containing t to the left, all other terms to the right
t=13.5
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