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Treat it like a normal equation. Except if you divide/multiply by a negative number you reverse the inequality. That's basically it.
No. You can solve an inequality in a similar way to an equation, but you end up with a range of answers (like X > 3) for each variable rather than set of exact answers (like X = 3)
Because of how close the two are. The only difference between the two is that a complex number is any whole number along side of a fraction, while a real number is any positive number.
The short answer, multiply on both sides of the equation by the inverse of the matrix you need to remove. Just like solving 3x = y for x. Multiply on both sides of the equation by 1/3.
3X + 2 + X - 6 = 25 gather like terms, 2 and -6 added together and X and 3X added together 4X - 4 = 25