Розділ 1. ЦІЛІ ВИРАЗИ » 280

Розв’яжи рівняння. a) (2x – 8) – (5x + 6) = 4; 2x – 8 – 5x – 6 = 4; –3x = 8 + 6 + 4; –3x = 18|: (–3); x = –6. б) 16y – (3 – 2y) + (7y + 1) = 48; 16y – 3 + 2y + 7y + 1 = 48; 25y = 48 + 3 – 1; 25y = 50|: 25; y = 2. в) 24 – (x2 + 8x – 17) = 5 – 5x – x2; 24 – x2 – 8x + 17 = 5 – 5x – x2; –8x + 5x = 5 – 24 – 17; –3x = –36|: (–3); x = 12. г) (x – 2x4 + 7) – (3x + 3 – 5x4) = 6 + 3x4. x – 2x4 + 7 – 3x – 3 + 5x4 = 6 + 3x4; 3x4 – 2x = 3x4 – 7 + 3 + 6; –2x = 2|: (–2); x = –1.