Answer:
12 H, 18 O, 6 C
Step-by-step explanation:

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first, we'll fo the h on the first equation:

multiply the 6 and 2 to get twelve.
in the second equation, we see that there is

so, in both there are 12 H.
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Now we'll do O.
in the first equation we have

so we have 6 + (6*2) or 6 + 12, which gives us 18
in the second equation we have

it's basically the same thing, just written differently, so we have 18.
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Finally, C.
In the first equation, we have
in the second
, again, same thing expressed differently.
both have 6 C.