Penyelesaian dari |2c+9|=|c-3|

[tex] |2c + 9| = |c - 3| \\ {(2c + 9)}^{2} - {(c - 3)}^{2} = 0 \\ (2c + 9 + c - 3)(2c + 9 - c + 3) = 0 \\ (3c + 6)(c + 12) = 0 \\ c = - 2 \: atau \: c = - 12[/tex]