3.3 Lösning 1a

\[\begin{array}{rclcl} \boxed{2\,x} \, - \, 6 \; & = & 10 & \qquad & {\rm Täck\;över\;} 2\,x \\ \boxed{\;\,?\;\,} \, - \, 6 \; & = & 10 & & \\ \quad \boxed{\,16\,} \, - \, 6 \; & = & 10 & & \end{array}\]

\[ \;\; \Downarrow \]

\( \; \begin{array}{rclcl} 2 \;\, \cdot \;\, x \; & = & 16 & \qquad & {\rm Täck\;över\;} x \\ 2 \;\, \cdot \; \boxed{x} & = & 16 & & \\ 2 \;\, \cdot \; \boxed{?} & = & 16 & & \\ 2 \;\, \cdot \; \boxed{8} & = & 16 & & \\ \end{array}\)

\[ \quad\; \Downarrow \]

\[ \, x \; = \; 8 \]

+++

\[ \quad \begin{array}{rclcl} x \;\, - \; 7 & = & 10 & \qquad & {\rm Täck\;över\;} x \\ \boxed{x} \;\, - \; 7 & = & 10 & & \\ 17 \;\, - \; 7 & = & 10 & & \\ \end{array}\]

\[ \quad\;\; \Downarrow \]

\[ \;\, x \; = \; 17 \]