Решите уравнение:

[tex]а) 0,15 ( х – 4 ) = 9,9 – 0,3 ( х – 1 ); [/tex]
[tex]б) 1,6 ( а – 4 ) –0,6 = 3 ( 0,4 а – 7 ).[/tex]

Пожалуйста помогите. ​
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