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8x+48=0
8x=-48 |:8
x= -6
-8x-7+31=0
-8x+24=0
-8x=-24
x=(-24):(-8)
x=4
x²-2*x*(-1)+(-1)²-(x²+2*x*4+4²)+2x+31=0
x²+2x+1-(x²+8x+16)+2x+31=0
x²+2x+1-x²-8x-16+2x+31=0
-4x=-16/(-4)
x=4
*---> to razy:D