№1 2х+30
№2 а+а+а -1-1-1
3а-3
№3 6+ab
№4 м+м+м+1-20
3м+(-19)
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а-1+а-1+а-13а-3
а-3=b+3=а-6+b
m+m-1+m-20=3m+21
№1 2х+30
№2 а+а+а -1-1-1
3а-3
№3 6+ab
№4 м+м+м+1-20
3м+(-19)