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30=150-20t
We move all terms to the left:
30-(150-20t)=0
We add all the numbers together, and all the variables
-(-20t+150)+30=0
We get rid of parentheses
20t-150+30=0
We add all the numbers together, and all the variables
20t-120=0
We move all terms containing t to the left, all other terms to the right
20t=120
t=120/20
t=6
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