Ответ:
\(-0.5(3x-4)+15x=4(1.5x+1)+3\).
\(-1.5x+2+15x=6x+4+3\),
\(13.5x+2=6x+7\),
\(7.5x=5\),
\(x=\frac{2}{3}\).\((2x-3)(2x+3)-x^2=12x-69+3x^2\).
\(4x^2-9-x^2=12x-69+3x^2\),
\(3x^2-9=3x^2+12x-69\),
\(12x=60\),
\(x=5\).
Ответ: а) \(x=\frac{2}{3}\); б) \(x=5\).
