7х+2х=279х=27х=316х-4х=6012х=60 х=54х+12х=20+1216х=32х=2х+123= 562; х= 439621-х=235; х= 856
7x +2x=27
9x=27
x=27:9
x=3
7х+2х=27
9х=27
х=3
16х-4х=60
12х=60
х=5
4х+12х=20+12
16х=32
х=2
х+123= 562; х= 439
621-х=235; х= 856
7x +2x=27
9x=27
x=27:9
x=3