Question 640906
3a + 3c =3(a+c)=33

My teacher wants me to figure out how she got the answer 33
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3a + 3c =3(a+c) but nothing more is known.
If a = 0 & c = 0, then it's 0
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If a = 10 & c = 20, then it's 90
There's no reason to think it's 33.