Question

Помогите плиз срочнооо!!! Алгебра​

Answer 1

$2x-6\leq 1+x\leq 12\; \; |-2x\\\\2x-6-2x\leq 1+x-2x\leq 12-2x\\\\-6\leq 1-x\leq 12-2x$