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We're not sure what the question means by "root". It may be what's usually

referred to as the "solution" of the equation ... the number that 'm' must be in

order to make the equation a true statement. Here's how to find the 'solution':

2m + 7 = 8 + m

Subtract 7 from each side:

2m = 1 + m

Subtract 'm' from each side:

m = 1

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14y ago

What else can I help you with?