Завдання 1301 - 1402 » 1383

Розв’яжи рівняння: 1) 4(x – 2) = –5x; 4x – 8 = –5x; 4x + 5x = 8; 9x = 8; x = 8/9. 2) –(4x – 7) = –7x; –4x + 7 = –7x; –4x + 7x = –7; 3x = –7; x = – 7/3; x = –21/3. 3) –6(x – 1) = 13; –6x + 6 = 13; –6x = 13 – 6; –6x = 7; x = – 7/6; x = –11/6. 4) 2(x + 1) = –(x – 3); 2x + 2 = 9x – 27; 2x – 9x = –27 – 2; –7x = –29; x = 29/7; x = 41/7.