What will be the heat of formation of me...

What will be the heat of formation of methane, if the heat of combustion of carbon is '-x' kJ, heat of formation of water is '-y' kJ heat of combustion of methane is '-z' kJ?

`(-x-y+z)kJ`

`(-z-x+2y)kJ`

`(-x-2y-z)kJ`

`(-x-2y+z)kJ`

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