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x = 12-7
x = 5
b. -x -4 = 13
-x = 13 +4
-x = 17
x = -17
c. -5 + x = -7
x = -7 + 5
x = -2
d. -11 -x = 18
-x = 18 + 11
-x = 29
x = -29
x = 12 -7
= 5
b. -x - 4 = 13
-x = 13 + 4
-x = 17
x = -17
c. -5 + x = -7
x = -7 + 5
x = -2
d. -11 -x =18
-x = 18 + 11
-x = 29
x = -29