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Find number abc

If 7a94a - 70c4b = a40c find number abc. Multiple solutions may exist.

Correct answers: 36

The first user who solved this task is Nílton Corrêa de Sousa.

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Colour printing press

In 1844, the first U.S. patent was issued for a printing press with different colours of ink applied in one impression (No. 3,744). The inventor, Thomas F. Adams of Philadelphia, Pa., called it "polychrome printing." The process used several ink fountains feeding different colour rollers which operated in parallel on the same axle, to produce stripes of different colours to ink corresponding lines of type.

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