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Pre-algebra · One-step equations

Solve for $x$ : $x + 7 = 12$

\htmlId{a0}{x}\mathbin{\htmlId{a1}{+}}\htmlId{a2}{7}\mathrel{\htmlId{a3}{=}}\htmlId{a4}{12}

x is stuck with a + 7. What gets it alone?

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Solve for n: 3n + 6 = 18

\htmlId{a0}{3}\htmlId{a1}{n}\mathbin{\htmlId{a2}{+}}\htmlId{a3}{6}\mathrel{\htmlId{a4}{=}}\htmlId{a5}{18}

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