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2x-x^2=4x+16-x^2-4x
2x-4x+4x-x^2+x^2=16
2x=16/:2
x=8
2. (x-3)(x-2)=(x-4)(x+1)
x^2-2x-3x+6=x^2+1x-4x-4
x^2-x^2-2x-3x-1x+4x=-4-6
-2x=-10/:(-2)
x=5
3. (x+2)(x-3)=(x-2)(x+3)
x^2-3x+2x-6=x^2+3x-2x-6
x^2-x^2-3x+2x-3x+2x=-6+6
-2x=0
x=0