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The important thing to note is that multiplication is just repeated addition. Thus nine x can be written as x+x+x+x+x+x+x+x+x. And we want to add another x onto the end of that. This can then be simplified back to the multiplication 10x. Therefore an equivalent expression to 9x+x is 10x
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Earn +20 ptsQ: What expression is equivalent to the expression nine x plus x?
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