puzzle #001

This "puzzle" is pretty much all basic algebra. (Source: Unknown, Date: July 16, 2003)


Using the integers 1 through 16 (inclusive), fill in the 16 blanks so that every equation (4 oriented horizontally and 4 oriented vertically) are mathematically correct. Order of operations exists here, so multiplication and division take precedence over addition and subtraction. "*" is used here to indicate multiplication, and "/" is used to indicate division.

+
-
*
=
-97
/
 
-
 
*
 
/
 
 
-
*
+
=
-107
+
 
/
 
-
 
+
 
 
-
-
/
=
-5
-
 
+
 
-
 
+
 
 
*
-
-
=
179
=
 
=
 
=
 
=
 
 
-4
 
12
 
51
 
19