"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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I don't know whether it's y^2-3y+2+3y-4y-5 or 2y-3y+2+3y-4y-5, so I'll do both.y^2-3y+2+3y-4y-5y^2+(-3y+3y-4y)+(2-5); group them togethery^2+(-4y)+(-3)y2-4y-3OR2y-3y+2+3y-4y-5(2y-3y+3y-4y)+(2-5); group them together(-2y)+(-3)-2y-3
If y + 3y + 10 = 70, then 4y + 10 = 70, and 4y = 60. We then find that y = 60/4 = 15.
X + 3y - 2y + 3y = X + (3-2+3)y = X + 4y
1
3x + 7y