Решите!!!!!!!!!!!!!!!!!!!!!!!!

Question

Решите!!!!!!!!!!!!!!!!!!!!!!!!

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Answer 1

Номер 2 30+15x-5=35x-25
15x-35x=5-25-30
-20x=-50
x=-50/-20
x=5/2=2,5

номер 3
а)7x(a-b)
б) 4xy(4y+3x)