(х+12)-10=32
х+12=32+10
х+12=42
х=42-12
х=30.
(30+12)-10=32
(х-5)-12=3
(х-5)=12+3
(х-5)=15
х=15+5
х=20
(20-5)-12=3
(х+12)-10=32
х+12=32+10
х+12=42
х=42-12
х=30.
(30+12)-10=32
(х-5)-12=3
(х-5)=12+3
(х-5)=15
х=15+5
х=20
(20-5)-12=3