a)
[tex]4 = \frac{x + 1}{2} |*2\\8 = x + 1 | - 1\\x = 7[/tex]
b)[tex]4 = x - 5 | + 5\\x = 11[/tex]
c)[tex]4 = 3x + 1 |- 1\\3x = 3 |:3\\x = 1[/tex]
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a)
[tex]4 = \frac{x + 1}{2} |*2\\8 = x + 1 | - 1\\x = 7[/tex]
b)
[tex]4 = x - 5 | + 5\\x = 11[/tex]
c)
[tex]4 = 3x + 1 |- 1\\3x = 3 |:3\\x = 1[/tex]