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khuangg
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x=3 ; x=4

khuangg
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let each of the brackets equal to 0 in the equation

seidi.yamauti
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something¹ x something² is equal zero if
something¹ is equal zero or
something² is equal zero

seidi.yamauti
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valid for as many somethings there can be

seidi.yamauti
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oh, and it is' and/or'
one can be, other can be or both