(-12)*(х+6,7)=0
раскроем скобки
-12x-80.4 = 0
12x+80.4 = 0
12x = -80.4
x = -6.7
(26,9-х)*8,1=45
217.89-8.1x = 45
-8.1x+172.89 = 0
8.1x-172.89 = 0
8.1x = 172.89
x = 21.344444444444
(-12)*(х+6,7)=0
раскроем скобки
-12x-80.4 = 0
-12x-80.4 = 0
12x+80.4 = 0
12x = -80.4
x = -6.7
(26,9-х)*8,1=45
раскроем скобки
217.89-8.1x = 45
-8.1x+172.89 = 0
8.1x-172.89 = 0
8.1x = 172.89
x = 21.344444444444