Equation Rearranger
A Manim-style lesson film you steer: click any variable and watch it isolated step by step, typeset like a 3Blue1Brown video. The operation is written on both sides, the cancelling pieces flash red and are struck through with the reason (m/m = 1), and everything else glides into place. Play it through, pause mid-move, step back and forth, or jump to any step. 20 equations, from F = ma to Newton's law of gravitation, Coulomb's law and T = 2π√(L/g).
Whatever you do to one side, you must do to the other. Watch the operation appear on both sides at once — a real new fraction or a real new term, not a floating label.
The pieces that cancel flash red and are struck through, with the reason written above (m/m = 1). Then everything else slides into the simplified equation.
The variable you are solving for is yellow throughout; every other variable keeps its own colour, and constants (G, k, π, ½, ε₀, c) are grey.
Play runs the whole derivation like a film; Next takes one step at a time. Space pauses, ← → step, F goes full screen. Click a step to jump straight to it.
1. Click a in F = ma. Both sides are divided by m; the two m’s cancel, leaving a on its own.
2. Switch to ρ = m/V and click V. V climbs out of the denominator first, then ρ is cleared the same way — two moves, in the right order.
3. When a derivation finishes, click a different variable: it carries on from what is on screen.
Click a variable to watch it isolate.
What Each Variable Means
force (N)
mass (kg)
acceleration (m/s²)