4х+ х/2=45
х/2=45-4х
х/2*2=(45-4х)*2
х=90-8х
х+8х=90
9х=90
х=90:9
х=10
10-2+10+2+10/2+2*10=45
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4х+ х/2=45
х/2=45-4х
х/2*2=(45-4х)*2
х=90-8х
х+8х=90
9х=90
х=90:9
х=10
10-2+10+2+10/2+2*10=45