Question

– 4х – 21 = - 7х – 3
7(3х – 4) – 5 = 9
плес

Answer 1

$- 4x - 21 = - 7x - 3 \\ - 4x + 7x = - 3 + 21 \\ 3x = 18 \\ x = 18 \div 3 \\ x = 6. \\ \\ 7(3x - 4) - 5 = 9 \\ 21x - 28 - 5 = 9 \\ 21x = 9 + 28 + 5 \\ 21x = 42 \\ x = 42 \div 21 \\ x = 2.$
Удачи)))))

Answer 2

$- 4x - 21 = - 7x - 3 \\ - 21 + 3 = -4x + 7x \\ - 18 = 3x \\ x = 18 \div 3 \\ x = 6$

$7(3x - 4) - 5 = 9 \\ 7 \times 3x - 4 \times 7 - 5 = 9 \\ 21x - 28 - 5 = 9 \\ 21x - 33 = 9 \\ 21x = 9 + 33 \\ 21x = 42 \\ x = 42 \div 21 \\ x = 2$