Let $\mathbf{a}$ and $\mathbf{b}$ be vectors such that the angle between $\mathbf{a}$ and $\mathbf{b}$ is $29^\circ,$ and the angle between $\mathbf{b}$ and $\mathbf{a} - \mathbf{b}$ is $84^\circ.$  Find the angle between $\mathbf{a}$ and $\mathbf{a} - \mathbf{b}.$
Since $\mathbf{a}, \mathbf{b},$ and $\mathbf{a-b}$ all lie in the same plane, from the diagram below, we see that the angle between $\mathbf{a}$ and $\mathbf{a} - \mathbf{b}$ is $84^\circ - 29^\circ = \boxed{55^\circ}.$

[asy]
unitsize(5 cm);

pair A, B, C, O;

O = (0,0);
A = (1,0);
B = extension(O, O + dir(29), A, A + dir(180 - 55));
C = O + A - B;

draw(O--A,red,Arrow(6));
draw(O--B,green,Arrow(6));
draw(C--A,green,Arrow(6));
draw(O--C,blue,Arrow(6));
draw(B--A,blue,Arrow(6));

label("$\mathbf{a}$", A/2, S);
label("$\mathbf{b}$", B/2, NW);
label("$\mathbf{b}$", (A + C)/2, SE);
label("$\mathbf{a} - \mathbf{b}$", C/2, SW);
label("$\mathbf{a} - \mathbf{b}$", (A + B)/2, NE);
label("$29^\circ$", (0.2,0.05));
label("$55^\circ$", (0.15,-0.05));
[/asy]