Ответ:
[tex]1) 7(4a+6)-12a=28a+42-12a=16a+42\\2) 8x-4(16-2x)=8x-64+8x=16x-64\\5) -(4,3x-2,4)-(5,8-2,6x)=-4,3x+2,4-5,8+2,6x=-1,7x-3,4[/tex]
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Ответ:
[tex]1) 7(4a+6)-12a=28a+42-12a=16a+42\\2) 8x-4(16-2x)=8x-64+8x=16x-64\\5) -(4,3x-2,4)-(5,8-2,6x)=-4,3x+2,4-5,8+2,6x=-1,7x-3,4[/tex]