=(x+3)[-(6-x)(2x+7)/(6-x)
=-(x+3)(2x+7)
=-(2x^2+13x+21)
=-2x^2-13x-21
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=(x+3)[-(6-x)(2x+7)/(6-x)
=-(x+3)(2x+7)
=-(2x^2+13x+21)
=-2x^2-13x-21
Penyelesaian :