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Proof step 18 from proof mod-mult-law (previous step)

i * (i0 - j * j1) - (j * j0) * (i0 - j * j1) = i * (i0 - j * j1) + (~ j0 * (i0 - j * j1)) * j, i = i |%| j + j * j0, i0 = i0 |%| j + j * j1, 0 < j ⊦ (i * i0) |%| j = (i * (i0 - j * j1) - (j * j0) * (i0 - j * j1)) |%| j, j = 0

User applied rule insert equation

And obtained the following new goals

Rule argument

pos: left 1 flags: discard

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