1/4х=-0,8
1/4=0,25
х=0,25:(-0,8)
х=-3,2
1/4 х=-0,8
х=-0,8 / 1/4
-10х=-2/5
х=-2/5 / -10
х=1/25
x^2-5x=0x(x-5)=0x1=0, x2=5