a) x - 5 = 8
x = 8 + 5
x = 13
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b) x - 9 = - 6
x = - 6 + 9
x = 3
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c) x - 15 = 0
x = 0 + 15
x = 15
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d) x - ( - 2 ) = 3
x + 2 = 3
x = 3 - 2
x = 1
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e ) x - ( - 4 ) = - 1
x + 4 = - 1
x = - 1 - 4
x = - 5
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f) x - ( - 1 ) = 0
x + 1 = 0
x = 0 - 1
x = - 1