If you mean: 3y = 19+5 then the value of y is 8
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y = 8
5y = 3y + 12 5y - 3y = (3y - 3y) + 12 2y = 12 y = 6
Actually, 2x + 3y + z is an expression, because it is a mathematical noun.
"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
3y + 2y + 4 + 1 = 805y + 5 = 805y = 75y = 15