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OpenStudy (anonymous):
(x-3)(x+7)-(x+1)(x+5)=0
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OpenStudy (anonymous):
\[ \mathrm{C.S.=-13} \]
OpenStudy (anonymous):
What part of this problem you don't understand exactly?
OpenStudy (anonymous):
The C.S. part
OpenStudy (anonymous):
\[(x-3)(x+7)-(x+1)(x+5)=0\\(x^2+4x-21)-(x^2+6x+5)=0\\-2x-26=0\\x=-13\]
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