Oh, dude, that's like super easy. So, 7c plus c is basically just adding up the number of c's, which gives you 8c. It's like math, but with letters instead of numbers. So yeah, 7c plus c equals 8c. Math made fun, right?
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Well I got this: 2c+7=9+6-7c+2c 2c+7=15-9c 11c+7=15 (add 9c) 11c=8 ( Subtract 7) 11---11 ( Divide 11) C=0.72
Gathering like terms together, this is equal to 5a + 3b + 7c.
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It equals 10c+2 because you have to combine like terms when you use variables. So since there is a 7c and a 3c you add those because it says plus add you end up with 10c+2 because you are still adding the 2.
It's likely that C was going to be the answer since A and B were incorrect. We don't know if there was going to be a D. Here's the correct answer: 5000000000 + 900000000 + 80000000 + 2000000 + 700000 + 50000 + 7