Question:
Triangle $ABC$ is a right triangle. If the measure of angle $PAB$ is $x^\circ$ and the measure of angle $ACB$ is expressed in the form $(Mx+N)^\circ$ with $M=1$, what is the value of $M+N$?

[asy]
draw((-10,0)--(20,0),linewidth(1),Arrows);
draw((0,0)--(10,10/sqrt(3))--(10+10/3,0),linewidth(1));

draw((10,10/sqrt(3))+dir(-150)--(10,10/sqrt(3))+dir(-150)+dir(-60)--(10,10/sqrt(3))+dir(-60),linewidth(1));

dot((-3,0));

draw(dir(180)..dir(105)..dir(30),linewidth(1));

label("P",(-3,0),NW);
label("A",(0,0),S);
label("$x^\circ$",(-1,1),N);
label("B",(10,10/sqrt(3)),N);
label("C",(10+10/3,0),NE);

[/asy]

Answer:
Since $\angle PAB$ and $\angle BAC$ are supplementary, $\angle BAC = 180^{\circ} - x^\circ$.  Since the three angles of a triangle add up to $ 180^{\circ} $, we have $\angle ACB = 180^{\circ} - 90^{\circ} - (180^{\circ} - x^\circ) = x^\circ - 90^{\circ}$.  Thus, $M + N = \boxed{-89}$.