percentages of the market held by State Farm, Progressive, American Family, and other companies, respectively.

$x=y+4z-27$

$z=15-2y+w$

$($Express your answer in terms of $w,$ where $x=x(w),y=y(w),$ and $z=z(w).)$

$\{$:$(x,y,z)=({]}_{})$

Which of the three companies' market share is most affected by the share held by other companies?

State Farm

Progressive

American Family Insurance Group