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x²-4x+56=x²
4x=56
x=14
2x(5+x)-2=6(x-2)+2x²
10x+2x²-2=6x-12+2x²
4x=-10
x=-2,5
(x-1)(x+2)=(x+3)(x+4)
x²+2x-x-2=x²+4x+3x+12
x-2=7x+12
-6x=14
x=-7/3
6x(3-2x)=5+4x(7-3x)
18x-12x²=5+28x-12x²
-10x=5
x=-0,5
5[2-6(x-1)]=10
5(2-6x+6)=10
40-30x=10
-30x=-30
x=1
1-[5(x+2)-7]=6(-x-3)
1-[5x+10-7]=-6x-18
1-5x-3=-6x-18
-2-5x=-6x-18
x=-16
4-4-[4-(4-x)]=4
-(4-4+x)=4
-x=4
x=-4
-4(4+x)+3=x(7-x)+5(x-9)
-16-4x+3=7x-x²+5x-45
-13-4x=12x-x²-45
x²-16x=32
x²-16x-32=0
Δ=(-16)²-4*32=128
√Δ=8√2
x1=(16-8√2)/2=8-4√2
x2=(16+8√2)/2=8+4√2