20(x-1) - 2(2x+3) = 18
20х-20-4х-6=18
16х-26=18
16х=44
х=44/16
х=11/4
х=2.3/4
и
2(2x+3)-20(x-1) = 18
4х+6-20х+20=18
-16х+26=18
16х=26-18
16х=8
х=8/16
х=1/2
ответ: 1/2 и 2.3/4
20(x-1) - 2(2x+3) = 18
20х-20-4х-6=18
16х-26=18
16х=44
х=44/16
х=11/4
х=2.3/4
и
2(2x+3)-20(x-1) = 18
4х+6-20х+20=18
-16х+26=18
16х=26-18
16х=8
х=8/16
х=1/2
ответ: 1/2 и 2.3/4