Завдання 1301 - 1402 » 1382

Розв’яжи рівняння: 1) 3(x – 2) = –10x; 3x – 6 = –10x; 3x + 10x = 6; 13x = 6; x = 6/13. 2) –(2x – 5) = –5x; –2x + 5 = –5x; –2x + 5x = –5; 3x = –5; x = – 5/3; x = –12/3. 3) –3(x – 3) = 7; –3x + 9 = 7; –3x = 7 – 9; –3x = –2; x = 2/3. 4) 5(x + 2) = 11(x – 3); 5x + 10 = 11x – 33; 5x – 11x = –33 – 10; –6x = –43; x = 43/6.