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x²-4-2x-2x-x²=8
-4x=8+4
-4x=12/:(-4)
x=-3
b) (3x+1)²-9x²=7
9x²+6x+1-9x²=7
6x=7-1
6x=6/:6
x=1
c) (4-x)(x+4)=2x-x²
4x+16-x²-4x=2x-x²
-2x=-16/:(-2)
x=8
d) (x+1)-(x+1)(x-1)=12
x²+2x+1-x²+x-x+1=12
x²+2x-x²+x-x=12-1-1
2x=10/:2
x=5