中文辅助说明
把等式中的任意一项拖到等号另一边，观察左右两式对应的曲线怎样改变。移项相当于等式两边同时加上或减去同一个函数，因此两条曲线的交点高度可能改变，但交点的 x 坐标和实数解个数保持不变。手机上也可以先点选一项，再点击等号另一边。
Interactive demonstration
Move a term across the equals sign
Drag a term to the other side, or tap a term and then tap the opposite side. Its sign changes, but every solution guide remains fixed.
Current equation
The two sides become two curves
Left side · blue curve Move selected term here
Right side · rose curve Move selected term here
Graphical view
Same solution lines, different curves
Dashed vertical lines mark the x-coordinates of every intersection.