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45=5(t-78)
We move all terms to the left:
45-(5(t-78))=0
We calculate terms in parentheses: -(5(t-78)), so:We get rid of parentheses
5(t-78)
We multiply parentheses
5t-390
Back to the equation:
-(5t-390)
-5t+390+45=0
We add all the numbers together, and all the variables
-5t+435=0
We move all terms containing t to the left, all other terms to the right
-5t=-435
t=-435/-5
t=+87
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