x^2-7x+3x-21=11+x^2+4x-4x-16
x^2-x^2-7x+3x-4x+4x=21+11-16
-4x=16
x=16/(-4)
x=-4
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x^2-7x+3x-21=11+x^2+4x-4x-16
x^2-x^2-7x+3x-4x+4x=21+11-16
-4x=16
x=16/(-4)
x=-4