Porque é que isto está certo:

3 {c}^{2} - 6c = 0 \\ 3( {c }^{2} - 3c) = 0 \\ {c}^{2} - 3c = 0

E isto tá errado:

 {c}^{2} - 3c = 0 \\ c(c - 3) = 0 \\ c - 3 = 0
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