3C means 3 times whatever the value of "C". Similary, 5S means 5 times whatever the value of "S" is.
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5s-r
6
4 + 3c = 2c + 2Subtract 4 from each side:3c = 2c - 2Subtract 2c from each side:c = -2
5s - 6 = 2s, ie 5s - 2s = 6, ie 3s = 6, ie s = 2
3c - 12 = 14 + 5cSubtract 3c from each side:-12 = 14 + 2cSubtract 14 from each side:-26 = 2cDivide each side by 2:-13 = c