[tex](x - 1)(x + 3) - 4y(2 - 3x) = {x}^{2} + 2x - 3 - 8y+ 12xy [/tex]
если там Х, а на У
[tex](x - 1)(x + 3) - 4x(2 - 3x) = {x}^{2} + 2x - 3 - 8x + 12 {x}^{2} = 13 {x}^{2} - 6x - 3[/tex]
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[tex](x - 1)(x + 3) - 4y(2 - 3x) = {x}^{2} + 2x - 3 - 8y+ 12xy [/tex]
если там Х, а на У
[tex](x - 1)(x + 3) - 4x(2 - 3x) = {x}^{2} + 2x - 3 - 8x + 12 {x}^{2} = 13 {x}^{2} - 6x - 3[/tex]