The right side of the equation to match the no solution will be
5x + 13
Equations have no solution if the lines does not intersect or the lines coincide
The given equation is
2x + 3(x + 7) - 8
Rewriting the equation
2x + 3x + 21 - 8
5x + 13
Hence the two equations 5x + 13 and 2x + 3(x + 7) - 8 will not have solution