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30=t/5+20
We move all terms to the left:
30-(t/5+20)=0
We get rid of parentheses
-t/5-20+30=0
We multiply all the terms by the denominator
-t-20*5+30*5=0
We add all the numbers together, and all the variables
-1t+50=0
We move all terms containing t to the left, all other terms to the right
-t=-50
t=-50/-1
t=+50
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