[tex]a) \: \: \: \: \: {3a}^{2} - 2a + 4 - 3 {a}^{2} + 2a + 2 = 6[/tex]
[tex]б) \: \: \: \: \: {3a}^{2} - 2a + 4 - 2 {a}^{2} + 2a - 4 = {a}^{2} [/tex]
[tex]в) \: \: \: \: \: {3a}^{2} - 2a + 4 - 3 {a}^{2} - 4 = - 2a[/tex]
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[tex]a) \: \: \: \: \: {3a}^{2} - 2a + 4 - 3 {a}^{2} + 2a + 2 = 6[/tex]
[tex]б) \: \: \: \: \: {3a}^{2} - 2a + 4 - 2 {a}^{2} + 2a - 4 = {a}^{2} [/tex]
[tex]в) \: \: \: \: \: {3a}^{2} - 2a + 4 - 3 {a}^{2} - 4 = - 2a[/tex]