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1
take x common from all expression x(1+y^ + y^z) = x so the answer is x
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the answer will be x
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x
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xy^z
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x + xy^ + xy^z = x[1 + y^ + y^z] = x
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since x is common in all the terms so x[1 + .....] = x
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x
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x
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=(x+xy'+xy'z) =(x(1+y')+xy'z) =(x+xy'z) =(x(1+y'z)) =x