193 aaaaaaaaaaaaaaaaaaaaaaa

1) 8(6x-7)-17x= 48x-56-17x=31x-56
2)9y- 5(17-y)=9y-85+5y=14y-85
3)0,6(4x-3)+2,1(x-5)=2,4x-1,8+2,1x-10,5=4,5x-12,3
4)2,5(4a-8b)-(3a-4b)*1,4=10a-20b-4,2a+5,6b=5,8a-14,4b
5)-(-5,2-3,1c)-(2,4c-6,4)=5,2+3,1c-2,4c+6,4=11,6+0,7c
6) $\frac{9}{16} (5 \frac{1}{3} x- \frac{2}{3} y)- \frac{7}{20} (2 \frac{5}{7} x-5 \frac{5}{7}y)= \frac{9}{16} ( \frac{16}{3} x- \frac{2}{3} y)- \frac{7}{20} ( \frac{19}{7} x- \frac{40}{7} y)$ = $3x- \frac{3}{8} y- \frac{19}{20} x-2y= \frac{60}{20} x- \frac{3}{8} y-\frac{19}{20}x-2y= \frac{41}{20} x-2 \frac{3}{8} y=2 \frac{1}{20} x-2 \frac{3}{8} y$