Частина 1 — Вправи: 364

364. Розв'яжи рівняння.

а) 2(3 – x) = 24;

3 – х = 24 : 2

3 – х = 12;

х = 3 – 12;

х = –9.

б) 4(x + 7) – 8 = 20;

4(х + 7) = 20 + 8;

х + 7 = 28 : 4;

х + 7 = 7;

х = 7 – 7;

х = 0.

в) –3(х – 6) + 5 = 17;

–3(х – 6) = 17 – 5;

х – 6 = 12 : (–3);

х – 6 = –4;

х = –4 + 6;

х = 2.

365.

а) 6(3 – x) = 36;

3 – х = 36 : 6;

3 – х = 6;

х = 3 – 6;

х = –3.

б) 8(x + 7) + 16 = –40;

8(х + 7) = –40 – 16;

8(х + 7) = –56;

х + 7 = –56 : 8;

х + 7 = –7

х = –14.

в) –5(х – 7) – 6 = 4;

–5(х – 7) = 4 + 6;

х – 7 = 10 : (–5);

х – 7 = –2;

х = –2 + 7;

х = 5.