Mark M. answered 02/01/21
Tutor
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Retired math prof. Very extensive Precalculus tutoring experience.
7log7x + 14log7y - 4log7z = log7(x7) + log7(y14) - log7(z4) = log7(x7y14) - log7(z4) = log7[x7y14 / z4]