Вправи: 337

337. Розв’яжи рівняння.

а) 2х-33 + 6-3х2 = –3| • 6;

2(2x – 3) + 3(6 – 3x) = –18;

4x – 6 + 18 – 9x = –18;

–5x = –18 + 6 – 18;

–5x = –30|: (–5);

x = 6.

б) 4x-12 – 3x+54 = 2| • 4;

2(4x – 1) – (3x + 5) = 8;

8x – 2 – 3x – 5 = 8;

5x = 8 + 2 + 5;

5x = 15| : 5;

x = 3.

в) x-52 + 3x-85 = –3| • 10;

5(x – 5) + 2(3x – 8) = –30;

5x – 25 + 6x – 16 = –30;

11x = –30 + 25 + 16;

11x = 11| : 11;

x = 1.

г) 2x – x+28 = 3x-22 | • 8;

16x – 2(x + 2) = 4(3x – 2);

16x – 2x – 4 = 12x – 8;

14x – 12x = 4 – 8;

2x = –4| : 2;

x = –2.