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Proof step 28 from proof Extsimple (previous step)

i1 / gcd(i1, j1) < 0, i1 / gcd(i1, j1) = i2 / gcd(i2, j2), j1 / gcd(i1, j1) = j2 / gcd(i2, j2), i1 < 0, j1 < 0, 0 < i2, j2 < 0 ⊦ i1 = 0, i2 = 0, j1 = 0, j2 = 0

User applied rule insert equation

And obtained the following new goals

Rule argument

pos: left 2 flags: discard

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