syntax – Simplify/Expand equation so that right side equals 0

Given an equation like
$$x^2 + (x + 82)^2 = (x + 100)^2,$$
how do I type to make this into
$$x^2-36x-3276=0; ?tag{1}$$
This almost does it

x^2 + (x + 82)^2 == (x + 100)^2 // Simplify // Expand

but not completely. Naturally,

x^2 + (x + 82)^2 - (x + 100)^2 // Simplify // Expand

partially solves it, but can Mathematica construct the equation (1)? TIA.