Name of solving equation by generating system of equations from similar variable power

Question

Is there a name for solving something like this?

$(a+b)s^3 + cs^2+(d+a)s+b=5s^3+4s^2+s+5$

by then setting

$a+b = 5$

$c=4$

$d+a=1$

$b=5$,

$\therefore a= 0, d=1$