a-(2a+6)+2(a-2b)=?3(5x+4)-(3x-5)=?
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![a-(2a+6)+2(a-2b)=?3(5x+4)-(3x-5)=?](/uploads/image/z/695996-44-6.jpg?t=a-%282a%2B6%29%2B2%28a-2b%29%3D%3F3%EF%BC%885x%2B4%EF%BC%89-%EF%BC%883x-5%EF%BC%89%3D%3F)
a-(2a+6)+2(a-2b)=?3(5x+4)-(3x-5)=?
a-(2a+6)+2(a-2b)=?3(5x+4)-(3x-5)=?
a-(2a+6)+2(a-2b)=?3(5x+4)-(3x-5)=?
a-(2a+6)+2(a-2b)
=a-2a-6+2a-4b
= a-4b-6
3(5x+4)-(3x-5)
=15x+12-3x+5
= 12x+17