ГДЗ Алгебра 7 клас Тарасенкова (2024)

Розв'яжіть рівняння:

1) 5х – 4 = 6; 5х = 6 + 4; 5х = 10; х = 2;
2) 5 – 2у = 11; –2у = 11 – 5; –2у = 6; у = –3;
3) 16 = 12 – 4х; 16 – 12 = –4х; 4 = –4х; х = –1;
4) –5 = 5у + 15; –5 – 15 = 5y ; –20 = 5y; у = –20 : 5; у = –4;
5) 2х = 4х + 12; 2х – 4х = 12; –2х = 12; х = 12 : (–2); х = –6;
6) –7y = 18 – 5y; – 7y + 5у = 18; –2y = 18; y = 18 : (–2); y = –9;
7) 6z + 3 = 66 + 3z; 6z – 3z = 66 – 3; 3z = 63; z = 21;
8) 5x – 22 = 5 – 4x; 5x + 4x = 5 + 22; 9x = 27; x = 3;
9) –12 – 7y = –4 + y; –7y – у = –4 + 12; –8y = 8; у = –1;
10) 2y + 3y = 28 – 2y; 2y + Зy + 2y = 28; 7y = 28; у = 4;
11) 18 – 12x + Зх = 6 – 5x; –12x + 3x + 5x = 6 – 18; –4x = –12; x = 3;
12) 5y –10 – 9y = 12y – 42; 5y – 9y – 12y = –42 + 10; –16 = –32; y = –32 : (–16); у = 2.