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-8x=-4 / ÷(-8)
x=1/2
b) x²-2x+1-3x> x²-4
x²-5x+1>x²-4
-5x>-5 /÷ (-5)
x<1
c) 2x-x²+x²-4=2
2x=6
x=3
d) x²-9-x²-4x+4≤19
-4x-5≤19
-4x≤24 / ÷(-4)
x≥-6
e) (x-2)/2- x²+2x+1= 1-x² / ×2
(x-2)+4x= 0
x-2 + 4x =0
-3x-2=0
-3x=2 /÷(-3)
x=-3/2
f) x²+x-x² <4x-12
x-4x<-12
-3x<-12 /÷(-3)
x> 4
g)x²-6x+9 -x²-4x-4≥0
-10x+5≥0
-10x≥5 /÷(-10)
x≤ -1/2
h) x²+2x-3x-6 + x²-8x+16 = 2x²+1
2x²-9x +10=2x²+1
-9x=11 /÷(-9)
x=11/9