+26387 5+_x6-3=14 ?
\(\begin{array}{rcll} 5+ \text{_} \times 6 - 3 &=& 14 \\ 5+ x \times 6 - 3 &=& 14 \quad & | \quad + 3\\ 5+ x \times 6 &=& 14 + 3\\ 5+ x \times 6 &=& 17 \quad & | \quad -5\\ x \times 6 &=& 12 \quad & | \quad :6 \\ x &=& \frac{12}{6} \\ \mathbf{x} &\mathbf{=}& \mathbf{2} \\ \end{array}\)
Probe:
\(\begin{array}{rcll} 5+ 2 \times 6 - 3 &=& 14 \\ 5+ 12 - 3 &=& 14 \\ 17 - 3 &=& 14 \\ 14 &=& 14 \\ \end{array}\)
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