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`a) 47 + 17 + x = 100`

`64 + x = 100`

`x = 100 - 64`

`x = 36`

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`b) 45 - 17 + x = 100`

`28 + x = 100`

`x = 100 - 28`

`x = 72`

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`c) 63 + 18 - x = 27`

`81 - x = 27`

`x = 81 - 27`

`x = 54`

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`d) 63 - 18 - x = 27`

`45 - x = 27`

`x = 45 - 27`

`x = 18`