Answer:
5
Step-by-step explanation:
The given equation is:__x+ 3 = 5x+19
Let the missing number be k, then
[tex]kx + 3 = 5x + 19[/tex]
Combine like terms to get:
[tex]kx - 5x = 19 - 3[/tex]
[tex](k - 5)x = 16[/tex]
For the equation to have no solution, the coefficient of x must be zero.
[tex]k - 5 = 0[/tex]
[tex]k = 5[/tex]
Therefore the missing number is 5
