1) 3(2x - 9) = 5(x - 4);

6x - 27 = 5x - 20;

6x - 5x = 27 - 20;

x = 7;

2) 7(3 - 2x) = 15(1 - x);

21 - 14x = 15 - 15x;

15x - 14x = 15 - 21;

x = -6.