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-23=t/2-20
We move all terms to the left:
-23-(t/2-20)=0
We get rid of parentheses
-t/2+20-23=0
We multiply all the terms by the denominator
-t+20*2-23*2=0
We add all the numbers together, and all the variables
-1t-6=0
We move all terms containing t to the left, all other terms to the right
-t=6
t=6/-1
t=-6
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