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18=20-t/5
We move all terms to the left:
18-(20-t/5)=0
We add all the numbers together, and all the variables
-(-t/5+20)+18=0
We get rid of parentheses
t/5-20+18=0
We multiply all the terms by the denominator
t-20*5+18*5=0
We add all the numbers together, and all the variables
t-10=0
We move all terms containing t to the left, all other terms to the right
t=10
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