## -moz-calc and -webkit-calc not working in iphone 6

Here i m trying to do css with calc
width: -moz-calc((-moz-calc(100% / 3)) - (-moz-calc(50px / 3)));
width: -webkit-calc((-webkit-calc(100% / 3)) - (-webkit-calc(50px / 3)));
width: calc(calc(100% / 3) - calc(50px / 3) );
but it is not working pro...

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