Завдання 1301 - 1402 » 1380

Розв’яжи рівняння: 1) 2(x – 3) = 4x; 2x – 6 = 4x; 2x – 4x = 6; –2x = 6; x = 6 : (–2); x = –3. 2) –(4x – 3) = –x; –4x + 3 = –x; –4x + x = –3; –3x = –3; x = –3 : (–3); x = 1. 3) –4(x + 5) = –16; –4x –20 = –16; –4x = –16 + 20; –4x = 4; x = 4 : (–4); x = –1. 4) 3(x 6 7) = 2(x – 8); 3x + 21 = 2x – 16; 3x – 2x = –16 – 21; x = –37. 5) 4(–x + 7) = –(x + 2); –4x + 28 = –x –2; –4x + x = –2 – 28; –3x = –30; x = –30 : (–3); x = 10. 6) –3(2 – x) = 4(x + 9); –6 + 3x = 4x + 36; 3x – 4x = 36 + 6; –x = 42; x = 42 : (–1); x = –42.