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<math> <mi>x</mi> <mo>+</mo> <mi>x</mi> <mo lspace='0px'>+</mo> <mi>x</mi> <mo rspace='0%'>+</mo> <mi>x</mi> <mo lspace='2em' rspace='1em'>+</mo> <mi>x</mi> <mo lspace='1cm' rspace='10px'>+</mo> <mi>x</mi> </math>