A linear equation in one variable is reduced to the form x=a using equivalent moves: transposing terms, expanding parentheses, and combining like terms.
The main goal is to isolate x: move everything in the way to the other side with the inverse operation.
Keep equality: do the same operation on both sides
Expand parentheses and combine like terms before the final step
Always check the solution by substitution
Step-by-step (addition / subtraction)
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