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log(t-3)=log(17-4t)
since they are both logs to the same base, what is inside must be the same
t-3 = 17 -4t
add 4t to each side
t-3+4t = 17-4t+4t
5t-3 = 17
add 3 to each side
5t -3+3 = 17+3
5t = 20
divide each side by 5
t =4