x=1/5-3,4=0,2-3,4=-3,2=-32/10=-16/5; -3/4X=5 X=5:-3/4=5x(-4/3)=-20/3; -3,1X=62 X=62:(-3,1)=62:(-31/10)=31:(-31/5)=31x(-5/31)=-5 ; 4,8X=3,6 X=3,6:4,8=36/10x10/48=36/48=6/8=3/4; X:(-3)=7 X=7x(-3)=-21 (X+2):4=-2 X+2=-2x4=-8 X=-8-2=-10; -3X=0 X=0:3=0; -15:X=3/2 X=-15:3/2=15x2/3=30/3=10