Tìm x, biết: (a) 2(3x−5)+2(1−x)=−4.

a) \(3\left( {2x - 3} \right) + 2\left( {2 - x} \right) = - 3\)

\(6x - 9 + 4 - 2x = - 3\)

\(6x - 2x = 9 - 4 - 3\)

\(4x = 2\)

\(x = \frac{1}{2}\).

Vậy \(x = \frac{1}{2}\).

b) \(3x\left( {2x + 3} \right) - \left( {2x + 5} \right)\left( {3x - 2} \right) = 8\)

\(6{x^2} + 9x - \left( {6{x^2} - 4x + 15x - 10} \right) = 8\)

\(6{x^2} + 9x - 6{x^2} + 4x - 15x + 10 = 8\)

\(\left( {6{x^2} - 6{x^2}} \right) + \left( {9x + 4x - 15x} \right) = 8 - 10\)

\( - 2x = - 2\)

\(x = 1\)

Vậy \(x = 1\).