If you mean: 2c+2+6c-4 then it is 8c-2 when simplified.
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4b - 2c is an expression, which is equal to 2(2b - c)
2c + 3
a + 7b + 2c
4c-7 = 2c+11 4c-2c = 11+7 2c = 18 c = 9
Oh, dude, you want me to do math? Alright, so in the expression 5d + 2c, "5" and "2" are the coefficients, and "d" and "c" are the variables. So, like, the variables are "d" and "c," and the numbers are 5 and 2. That's it, that's the math lesson for today.