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| Rad 1: |
Rad 1: |
| − | ::<math>\begin{array}{rclcl} x \, + \, (x \, + \, 6) & = & 12 & & \\
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| − | x \, + \, x \, + \, 6 & = & 12 & & \\
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| − | 2\,x \, + \, 6 & = & 12 & \qquad | & - \, 6 \\
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| − | 2\,x \, + \, 6 \, - \, 6 & = & 12 \, - \, 6 & & \\
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| − | 2\,x \, & = & 6 & \qquad | & / \; 2 \\
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| − | \displaystyle \frac{2\,x}{2} & = & \displaystyle \frac{6}{2} & & \\
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| − | x \, & = & 3 & &
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| − | \end{array}</math>
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| − | Kontroll<span style="color:black">:</span>
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| − | <math> \, x = 3 \quad </math> insatt i <math> \quad x \, + \, (x \, + \, 6) \, = \, 12 \, </math><span style="color:black">:</span>
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| − | VL <math> \, = \, 3 \, + \, (3 \, + \, 6) \, = \, 3 \, + \, 3 \, + \, 6 \, = \, 12 </math>
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| − | HL <math> \, = \, 12 </math>
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| − | VL <math> \; = \; </math> HL <math> \quad \Longrightarrow \quad </math> OK
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