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The factor of -10x-30xy is -10x. This is because 10 is the highest number that both -10x and -30xy can be divided by, the "-" sign was added because it is another common element between -10x and -30xy, the same applies to the x.
When factored, -10x-30xy looks like -10x(1+30y) [the x is not a multiplication symbol]. When expanding it both the 1 and the 30y are multiplied by -10x.
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Q: What is the factor -10x-30xy?
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