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"3y + 4y = 19" is a mathematical sentence involving one unknown, y.

If you wanted it solved (ie you meant to ask; "What is y in 3y plus 4 y equals 19"), then:

3y + 4y = 19

→ (3 + 4)y = 19

→ 7y = 19

→ y = 19/7 = 2 5/7 ≈ 2.71

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