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-3t-5t=-3(t-15)
We move all terms to the left:
-3t-5t-(-3(t-15))=0
We add all the numbers together, and all the variables
-8t-(-3(t-15))=0
We calculate terms in parentheses: -(-3(t-15)), so:We get rid of parentheses
-3(t-15)
We multiply parentheses
-3t+45
Back to the equation:
-(-3t+45)
-8t+3t-45=0
We add all the numbers together, and all the variables
-5t-45=0
We move all terms containing t to the left, all other terms to the right
-5t=45
t=45/-5
t=-9
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