while (<DATA>) {
	@fractions = m!(\d+/\d+)!g;
	print eval($_), " " foreach @fractions;
	print "\n";
}

__DATA__
SYMM     1/8 - X, 1/8 + Y, 1/8 + Z
SYMM     1/6 - X, 1/6 + Y, 1/6 + Z
SYMM     1/4 - X, 1/4 + Y, 1/4 + Z
SYMM 1/2 - X, 1/2 + Y, 1/2 + Z