Question

пожалуйста!! три задания, срочно!!

Answer 1

Ответ:

$(x + 2) + x = 9 \\ 1x + 2x = 9 \\ 3x = 9 \\ x = 9 \div 3 \\ x = 3$

$4x = 8 \\ x = 8 \div 4 \\ x = 2$

$21 - 5x = 6 \\ 5x = 6 - 21 \\ 5x = - 1 5\\ x = - 15 \div 5 \\ x = - 3$