x²+7x-3x-21-x²+4x-8x+32=11
x²-x²+7x-3x+4x-8x=11+21-32
0x=0
x є R
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x²+7x-3x-21-x²+4x-8x+32=11
x²-x²+7x-3x+4x-8x=11+21-32
0x=0
x є R