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20+15t=300+10t
We move all terms to the left:
20+15t-(300+10t)=0
We add all the numbers together, and all the variables
15t-(10t+300)+20=0
We get rid of parentheses
15t-10t-300+20=0
We add all the numbers together, and all the variables
5t-280=0
We move all terms containing t to the left, all other terms to the right
5t=280
t=280/5
t=56
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