The best replacement for inequalities is and.

The best alternatives to inequalities are rated as following:

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★	equalities
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Speaking about inequalities, one probably shouldn't forget about absolute value.

Other search terms related to inequalities and their ratings are:

★★★★★	absolute value
★★	absolute values
★★	no solution
★★	fractions and variables
★	negative numbers
	number lines
	modulus

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inequalities

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equations