#### Answer

y = -10

#### Work Step by Step

2y + 10 = 5y - 4y
Combine like terms:
2y + 10 = y
Subtract y from both sides:
y + 10 = 0
Subtract 10 from both sides:
y = -10
Check with substitution:
2(-10) + 10 = 5(-10) - 4(-10)
-20 + 10 = -50 + 40
-10 = -10