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20t+20+20t+20+20t+20=180
We move all terms to the left:
20t+20+20t+20+20t+20-(180)=0
We add all the numbers together, and all the variables
60t-120=0
We move all terms containing t to the left, all other terms to the right
60t=120
t=120/60
t=2
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