(x+1) (6-x) + (x-8) (x+12) =0
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=6x-x^2+6-x+x^2+12x-8x-96=0
=9x-90=0
=9x=90
=x=90/9
=x=10 is your answer
=9x-90=0
=9x=90
=x=90/9
=x=10 is your answer
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