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a) -4-x = -13
-4 = -13+x
-4+13 = x
9 = x ----> x = 9
b) 3-x = 11
3-11 = x
-8 = x -----> x = -8
c) x-7 = -7
x = -7+7
x = 0
b. 3 - 11=x -8=x
c. x=7 + 7 x = 14