x^2-7x+12=0 x^2-4x-3x+12=0 x\sol(x-4\sağ)-3\sol(x-4\sağ)
ortak alma (x-4)
\sol(x-4\sağ)\sol(x-3\sağ)=0 x-4=0\:veya\:x-3=0 x=4\:veya\:x=3
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