-- This one works!
local coolVector = Vector3.new(2, 3, 4)
local anotherCoolVector = Vector3.new(10, 0, 0)

coolVector = coolVector * 2 + anotherCoolVector * 0.5
print(coolVector)


-- This one errors! :(
local coolVector = Vector3.new(2, 3, 4)
local anotherCoolVector = Vector3.new(10, 0, 0)

coolVector *= 2 + anotherCoolVector * 0.5
print(coolVector)