[tex]a)\\\\ -(a+2b)-(b-2a)= - a-2b-b+2a=a-3b\\\\b)\\\\-(4x+7y-5)-(7y+2x)-3y=- 4x-7y+5-7y-2x -3y=-6x-17y+5\\\\c)\\\\12(3x+4y+5)-12(-3x+4y-5)=36x+48y+60+36x-48y+60=72x+120[/tex]
[tex]d)\\\\ -5(\frac{1}{25} x+ \frac{1}{15}xy - \frac{1}{10}y)-2( \frac{1}{10} x - \frac{1}{4} y)= - \frac{1}{ 5} x- \frac{1}{3}xy + \frac{1}{2}y - \frac{1}{5} x + \frac{1}{2 } y =\\\\= -\frac{2}{5}x-\frac{1}{3}xy+y\\\\e)\\\\ \left [5(2x-4y)+6(-10x-15y) \right ] :10=(10x-20y-60x-90y):10=\\\\=(-50x-110y):10=-5x-11y[/tex]
