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20-2t=-20+18t
We move all terms to the left:
20-2t-(-20+18t)=0
We add all the numbers together, and all the variables
-2t-(18t-20)+20=0
We get rid of parentheses
-2t-18t+20+20=0
We add all the numbers together, and all the variables
-20t+40=0
We move all terms containing t to the left, all other terms to the right
-20t=-40
t=-40/-20
t=+2
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