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15t+(20t+5)=180
We move all terms to the left:
15t+(20t+5)-(180)=0
We get rid of parentheses
15t+20t+5-180=0
We add all the numbers together, and all the variables
35t-175=0
We move all terms containing t to the left, all other terms to the right
35t=175
t=175/35
t=5
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