Завдання 1301 - 1402 » 1377

Розв’яжи рівняння: 1) 1/2x – 5 = 7 – 1/2x; 1/2 x + 1/2x = 7 + 5; x = 12. 2) 11/3x + 8 = 1/3x – 7; 11/3x – 1/3x = – 7 – 8; x = –15. 3) 11/5x – 9 = – 4/5x + 4; 11/5x + 4/5x = 4 + 9; 2x = 13; x = 13 : 2; x = 6,5. 4) 4/7x + 3 = 3/7x – 2; 4/7 x – 3/7 x = –2 – 3; 1/7 x = –5; x = –5 : 1/7; x = –35. 5) –22/7x + 9 = – 2/7x – 5; –22/7x + 2/7x = –5 – 9; –2x = –14; x = –14 : (–2); x = 7. 6) 21/3x + 2 = 4 – 22/3x; 21/3x + 22/3x = 4 – 2; 5x = 2; x = 2 : 5; x = 0,4.