\[(2x + 3) + (3x + 4) + (5x + 5) =\]
\[= 12 - 7x\]
\[2x + 3 + 3x + 4 + 5x + 5 + 7x = 12\]
\[17x = 12 - 3 - 4 - 5\]
\[17x = 0\]
\[x = 0.\]