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13000=-125(t-122)
We move all terms to the left:
13000-(-125(t-122))=0
We calculate terms in parentheses: -(-125(t-122)), so:We get rid of parentheses
-125(t-122)
We multiply parentheses
-125t+15250
Back to the equation:
-(-125t+15250)
125t-15250+13000=0
We add all the numbers together, and all the variables
125t-2250=0
We move all terms containing t to the left, all other terms to the right
125t=2250
t=2250/125
t=18
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