12-(4x-18)=(36-5x)+(28-6x)
12 -4x +18 =36 -5x +28 -6x 30 -4x =64 -11x -4x +11x =64 -30 7x =34 x =34 ÷ 7 x =4 целых 6/7
12-(4х-18)=(36-5х)+(28-6х) 12-4х+18=36-5х+28-6х 5х-4х+6х=36+28-12-18 7х=34 х=4⁶/₇ Ответ:4⁶/₇