3x = 3x is true for all values of x.
Hence, x| x is a set all real numbers. ( -∞,∞ )
Given the equation in the question;
Remove the parenthesis using the distributive property.
3(2x + 2) - 3x = 6 + 3x
3×2x + 3×2 - 3x = 6 + 3x
6x + 6 - 3x = 6 + 3x
6x - 3x = 6 - 6 + 3x
6x - 3x = 3x
3x = 3x
3x = 3x is true for all values of x.
Hence, x| x is a set all real numbers. ( -∞,∞ )
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