How in gods name can get a value of 600 watts from 2 sources

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Someone needs to explain to me how in God's name can you get a value of 600 watts from 2 sources, one of value 400 watts and another of -600 watts?

Reference no: EM13272255

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How in gods name can get a value of 600 watts from 2 sources : Someone needs to explain to me how in God's name can you get a value of 600 watts from 2 sources, one of value 400 watts and another of -600 watts
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