
Larry C. answered 03/07/18
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Did you actually mean "There are 50 total pencils and the large box holds 6 less than 7 times those in the small box", because the problem doesn't make sense as written. Assuming so,
L+S=50 so L = 50-S
L=7S-6
Thus 50-S=7S-6
Solve for S and you can then also derive L.