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You need not have x in an algebraic equation. You solve whichever one is the easiest and that depends on the set of equations that you have.
Algebraic inequalities can be solved in the same fashion as algebraic equations. The goal here, as in algebraic equations, is to isolate the variable. The one thing to remember, however, is that when dividing or multiplying both sides by a negative number, one must switch the inequality sign.
You solve algebraic expressions by getting the variable by itself.
wolframalpha.comYou can insert any equation in it and Wolfram|Alpha will solve it.