If $PQ$ is a straight line, what is the value of $x$? [asy]

size(150);

draw((-1,0)--(1,0));

draw((-0.809,.588)--(0,0)--(0.809,.588));

draw((-.309,.951)--(0,0)--(.309,.951));

label("$P$",(-1,0),W);

label("$Q$",(1,0),E);

label("$x^\circ$",(0.5,0),NW);

label("$x^\circ$",(-0.5,0),NE);

label("$x^\circ$",(0,0.4));

label("$x^\circ$",(0.27,0.2),N);

label("$x^\circ$",(-0.27,0.2),N);

[/asy]
Since $PQ$ is a straight line, then $x^\circ+x^\circ+x^\circ+x^\circ+x^\circ = 180^\circ$ or $5x=180$ or $x=\boxed{36}$.