23х+41х=23.2-7.2
64х=16
х=16/64
х=0.25
32.8-8х=67.2/12
32.8-8х=5.6
8х=32.8-5.6
8х=27.2
х=3.4
19х+45х=169.3-9.3
64х=160
х=2.5
35.5-7х=86.4/16
35.5-7х=5.4
7х=35.5-5.4=30.1
х=30.1/7=4.3
23х+41х=23.2-7.2
64х=16
х=16/64
х=0.25
32.8-8х=67.2/12
32.8-8х=5.6
8х=32.8-5.6
8х=27.2
х=3.4
19х+45х=169.3-9.3
64х=160
х=2.5
35.5-7х=86.4/16
35.5-7х=5.4
7х=35.5-5.4=30.1
х=30.1/7=4.3