Пошаговое объяснение:
12x+7=-6*(-x+3)-2
12х+7=6х-18-2
12х-6х=-20-7
6х=-27
х=-27/6
х=-9/2
х=-1 1/2
1/3 x+2 1/2=5/6x-2 2/3
2/6х-5/6х=-2 4/6-2 3/6
-3/6х=-4 7/6
-3/6х=-5 1/6
х=-31/6:(-3/6)
х=31/6*6/3
х=31/3
х=10 1/3
