Question

51. a) 4(x - 5) - (7x + 9) = 1;
6) 2x - 304 - x) = 5 - (x - 1);
B) 8(3 - 2x) - (x - 2) = 9;
r) 5x – 6(2x + 7) = 13 - (x + 1).
​

Answer 1

Ответ:

а)

$4(x - 5) - (7x + 9) = 1 \\ 4x - 20 - 7x - 9 = 1 \\ - 3x - 29 = 1 \\ - 3x =1 + 29 \\ - 3x = 30 \\ x = 30 \div - 3 \\ x = - 10$

б)

$2x - 304 - x = 5 - (x - 1) \\ x - 304 = 5 - x + 1 \\ x - 304 = 6 - x \\ x + x = 6 + 304 \\ 2x = 310 \\ x = 310 \div 2 \\ x = 155$

в)

$8(3 - 2x) - (x - 2) = 9 \\ 24 - 16x - x + 2 = 9 \\ - 17x + 26 = 9 \\ - 17x = 9 - 26 \\ - 17x = - 17 \\ x = - 17 \div - 17 \\ x = 1$

г)

$5x - 6(2x + 7) = 13 - (x + 1) \\ 5x - 12x - 42 = 13 - x - 1 \\ - 7x - 42 = 12 - x \\ - 7x + x = 12 + 42 \\ - 6x = 54 \\ x = 54 \div - 6 \\ x = - 9$