Выражение 12×a×5×2 4b×25×7 15c×9×4 9x+7x+3x 15y-6y+of 52x-16x+9x 8 (x+6)-28 7 (2x+3)-10x 4 (9x+7)-26x

12×a×5×2=120а
4b×25×7=700b
15c×9×4=540c
9x+7x+3x=19x
15y-6y+of=9у+?
52x-16x+9x=45х
8 (x+6)-28=8х+48-28=8х+20
7 (2x+3)-10x=14х+21-10х=4х+21
4 (9x+7)-26x=36х+28-26х=10х+28