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perl -e 'print ((.0425*2) + .0025 ) - ((.0425*2) + .0025 ); print $/;'

$ perl -we 'print ((.0425*2) + .0025 ) - ((.0425*2) + .0025 ); print $
+/;'
print (...) interpreted as function at -e line 1.
Useless use of subtraction (-) in void context at -e line 1.
0.0875

$ perl -we 'print (((.0425*2) + .0025 ) - ((.0425*2) + .0025 )); print
+ $/;'
0

$ perl -we 'print +((.0425*2) + .0025 ) - ((.0425*2) + .0025 ); print 
+$/;'
0