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Find the unknown number in each equation:\newline a+12=31a+12=31

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Full solution

Q. Find the unknown number in each equation:\newline a+12=31a+12=31
  1. Identify isolate 'a': Identify what needs to be isolated; here, it's ' extit{a}'. Subtract 1212 from both sides to isolate ' extit{a}'. \newlineCalculation: 31−12=1931 - 12 = 19
  2. Subtract 1212: Check the solution by substituting aa back into the original equation.\newlineCalculation: 19+12=3119 + 12 = 31

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