Solve one-step equations and interpret the solution in context.
Solve and check a one-step equation
Problem
Solve \(x~+~9~=~15\), then substitute the solution into the original equation. Report the solution followed by the complete numerical check.
Big Picture
What this problem is really about
First undo the added nine with equal subtraction on both sides to isolate the variable. The verification is a separate step: replace the variable in the original equation with the computed value and evaluate both sides completely. A genuine check ends with the same number on each side, rather than merely repeating the isolated equation.
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