35) 5x - 3 + 7x - 4 = 8 - 15 + 11x; 5x + 7x - 11x = 8 - 15 + 3 + 4; x = -4.

37) 7 - 5x - 8 + 4x + 5x + 6 = 8; - 5x + 4x + 5x = 8 - 7 + 8 - 6; 4x = 3; x = 0,75.

39) 4(3x - 5) = x + 3; 12x - 20 = x + 3; 12x - x = 3 + 20; 11x = 23; x = 2(1/11).

40) 2 - x = 3x - 9; -x - 3x = -9 - 2; -4x = -11; x = 2,75