5х -3 - 16 - 8х < 5x + 20 + 2
- 8 x< 22 + 18
- 8x < 40
x < - 5
( 3A - 3B ) / ( A^2 - B^2 ) = ( 3 * ( A - B )) / ( A - B)*( A + B ) =
= 3 / ( A + B )
3 ^ ( x + 1 ) * 2 ^ x = 108
3 ^ x * 3 * 2 ^ x = 108
6 ^ x = 108 : 3
6 ^ x = 36
6 ^ x = 6 ^ 2
x = 2
0.3x-1.4x-y+0.1x=-1.1x+0.1x-y=-x-y