Odpowiedź:
[tex]a)3x + 7 = 2x + 1 \\ 3x - 2x = 1 - 7 \\ x = - 6 \\ b)7 - 2x = 5x + 28 \\ - 2x - 5x = 28 - 7 \\ - 7x = 21 \\ x = 21 \div ( -7 ) \\ x = - 3 \\ [/tex]
[tex]c)2(3 - x) + 7 = 4x - 5(2 + x) \\ 6 - 2x + 7 = 4x - 10 - 5x \\ 13 - 2x = - x - 10 \\ - 2x + x = - 10 - 13 \\ - x = - 23 \\ x = 23 [/tex]
[tex]d)5x - 7 = 5(x - 7) \\ 5x - 7 = 5x - 35 \\ 5x - 5x = - 35 + 7 \\ 0 = - 28 = równanie \: sprzeczne \\ [/tex]
[tex]e)7x + 36 = 6(x + 6) + x \\ 7x + 36 = 6x + 36 + x \\ 7x + 36 = 7x + 36 \\ 7x - 7x = 36 - 36 \\ 0 = 0 = równanie \: tożsamościowe[/tex]
