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-20-18t=18+t
We move all terms to the left:
-20-18t-(18+t)=0
We add all the numbers together, and all the variables
-18t-(t+18)-20=0
We get rid of parentheses
-18t-t-18-20=0
We add all the numbers together, and all the variables
-19t-38=0
We move all terms containing t to the left, all other terms to the right
-19t=38
t=38/-19
t=-2
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