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Try reviewing these fundamentals first

Algebra

Model and solve one-step linear equations: $ax = b$, $\frac{x}{a} = b$Algebra

Solving two-step linear equations using addition and subtraction: $ax + b = c$Algebra

Solving two-step linear equations using multiplication and division: $\frac{x}{a} + b = c$Algebra

Solving two-step linear equations using distributive property: $\;a\left( {x + b} \right) = c$