Complex macros with four arguments

name	meaning
QLA_c_eq_c_times_c_plus_c(c,a,x,b)	c = ax + b
QLA_c_eq_c_times_c_minus_c(c,a,x,b)	c = ax - b
QLA_c_eq_c_times_r_plus_r(c,a,x,b)	$c = ax + b \ \ \mbox{($x$\ real)}$
QLA_c_eq_c_times_r_minus_r(c,a,x,b)	$c = ax - b \ \ \mbox{($x$\ real)}$
QLA_c_eq_r_times_c_plus_c(c,a,x,b)	$c = ax + b \ \ \mbox{($a$\ real)}$
QLA_c_eq_r_times_c_minus_c(c,a,x,b)	$c = ax - b \ \ \mbox{($a$\ real)}$