C = 5
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This does not sound like an equation. This sounds like evaluating an algebraic expression. 3C means 3 times the value of C (which you have given as 21) then subtract 15. 3 x 21 - 15 = 48
The value of 'c' that makes the equation a true statement is the answer.Here's how to find it:Write the equation:3c - 15 = 17 - cAdd 'c' to each side:4c - 15 = 17Add 15 to each side:4c = 32Divide each side by 4:c = 8
c < -5
Doing it step by step:-7 = -3c + 933c = 7 + 933c = 100c= 33 1/3
36-4c-3c=22 -7c=22-36 -7c=-14 therefore c=2