3(2x – 1) + 5 (3 – x), x = –1,5;
– 2x(x2 – x + 3) + x(2x2 + x – 5), x = 3;
(x – 2)(3 – 2x) + 2x(x – 3x), x = – 5;
(x – 10)2 – (x – 3)(5 + x), x = 10.