36) 4x + 3 - 10x - 11 = 7 + 13 - 4x; 4x - 10x +4x = 7 + 13 - 3 + 11; -2x = 28; x = -14
38) 3 - 2x + 4 - 3x + 5 - 5x = 12 + 7x; - 2x - 3x - 5x - 7x = 12 - 3 - 4 - 5; -17x = 0; x = 0.
41) Обе части уравнения умножим на 20:
4(x - 3) + 5(x + 2) = 10; 4x - 12 + 5x + 10 = 10; 4x + 5x = 10 + 12 - 10; 9x = 12; x = 12/9; x = 4/3 = 1(1/3).
43) Обе части уравнения умножим на 6:
3(4x - 3) - 2(5 - 2x) - (3x - 7) = 0; 12x - 9 - 10 + 4x - 3x + 7 = 0; 12x + 4x - 3x = 0 + 10 + 9 - 7; 13x = 12; x = 12/13.
45) Обе части уравнения умножим на 30:
6(x + 4) - 10(x + 3) = 30x - 150 - 15(x - 2); 6x + 24 - 10x - 30 = 30x - 150 - 15x + 30; 6x - 10x - 30x + 15x = - 150 + 30 - 24 + 30; 19x = -114; x = -144 : 19 = -6