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21(t-8)=115
We move all terms to the left:
21(t-8)-(115)=0
We multiply parentheses
21t-168-115=0
We add all the numbers together, and all the variables
21t-283=0
We move all terms containing t to the left, all other terms to the right
21t=283
t=283/21
t=13+10/21
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