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4a: solve equations and inequalities in one variable
4b: rewrite formulas in terms of a specific variable and solve literal equations
4c: solve equations using multiple methods (tables, graphs, technology, intersection of graphs)
4d: explain each step when solving an equation using properties of equality and justify solutions
4e: graph the solutions to a linear inequality in two variables as a half-plane
4f: write equations and inequalities and use them to solve problems