1. а) 5в=-85,6-3в
5в+3в=-85,6
8в=-85,6
в=-10,7
б) 5/6в-5/9в+1=1/2в+1/3
5/6в-5/9в-1/2в=1/3-1
30/36в-20/36в-18/36в=-2/3
-8/36в=-2/3
-2/9в=-2/3
в=-2/3 : (-2/9)
в=-2/3 * (-9/2)
в=9/3
в=3
3.
d-1 /11 = 2d-3 / 8
8*(d-1)=11*(2d-3)
8d-8=22d-33
33-8=22d-8d
25=14d
d=25/14
d=1 11/14