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Sagot :
because 12(m=n) means that you are multiplying 12 times m and 12 times n. So if there is a number outside of parenthesis it gets multiplied by all the nu,beds in the parenthesis.
12(1+2)
36 either way. that is proof. if you want more proof use any number in replace of n and m
12(1+2)
36 either way. that is proof. if you want more proof use any number in replace of n and m
Because of the distributive property. You multiply the outside number (12) by the variables inside the parentheses (m and n). Then you add them together, so you get 12m+12n.
You can check it by plugging in numbers for m and n, then solving it both ways. You will get the same answer.
You can check it by plugging in numbers for m and n, then solving it both ways. You will get the same answer.
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