(x+3)(x-7)-(x-4)(x+4)=11
x^2-7x+3x-21-x^2-4x+4x+16=11
-4x-5=11
-4x=11+5
-4x=16
x=16:(-4)
x=-4
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(x+3)(x-7)-(x-4)(x+4)=11
x^2-7x+3x-21-x^2-4x+4x+16=11
-4x-5=11
-4x=11+5
-4x=16
x=16:(-4)
x=-4