It's a simple linear equation in one unknown.
If you'd like to know what value of 'c' makes it true, you can find it like this:
7 = -3c - 2
Add 3c to each side:
7 + 3c = -2
Subtract 7 from each side:
3c = -9
Divide each side by 3:
c = -3
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4c+2 = 3c+9 4c-3c = 9-2 c = 7
If you mean 3c = 214, then c = 68
17-3= 4c+3c c=2
The solution (not sum) to the equation 21 = 3c + 6 is as follows:21 = 3c + 621 - 6 = 3c + 6 - 615 = 3c3c = 153c/3 = 21/3c = 7
a=2b 4b=6c becomes 2b=3c a=3c