12-2c = 2c
add 2c to both sides
12 = 4c
divide both sides by 4
3 = c
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An equation where c = 5
That would be 10
Without any information about a or b or c, all that can be said is: a + b + 2c = a + b + 2c Not particularly illuminating!
4 + 3c = 2c + 2Subtract 4 from each side:3c = 2c - 2Subtract 2c from each side:c = -2
2c + 3 = 15 Subtract 3 from both sides: 2c = 12 Divide both sides by 2: c = 6