Длина равна: 6:20=0,3м................
X-0,46x-0,14x+4,08=6.88
0,4x+4.08=6.88
0,4x=6,88-4.08
0,4x=2.8
x=7
Ответ: 0.21х=6.3 2.7х=2.727
х=6.3/0.21 х=2.727/2.7
х=30 х=1.01
0.21*30=6.3 2.7*1.01=2.727
6.3=6.3 2.727=2.727
0.6х=4.2 13.5х=1.08
х=4.2/0.6 х=1.08/13.5
х=7 х=0.08
0.6*7=4.2 13.5*0.08=1.08
4.2=4.2 1.08=1.08
0.09х=94.5
х=94.5/0.09
х=1050
-6х-8+6х+8=20х-8-5х-8
15х-16=0
15х=16
х=16/15